161102520 has 160 divisors (see below), whose sum is σ = 570200400. Its totient is φ = 40684032.

The previous prime is 161102519. The next prime is 161102521. The reversal of 161102520 is 25201161.

161102520 is a `hidden beast` number, since 1 + 611 + 0 + 2 + 52 + 0 = 666.

161102520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161102519) and next prime (161102521).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 161102493 and 161102502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161102521) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 60252 + ... + 62868.

Almost surely, 2^161102520 is an apocalyptic number.

161102520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161102520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285100200).

161102520 is an abundant number, since it is smaller than the sum of its proper divisors (409097880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161102520 is a wasteful number, since it uses less digits than its factorization.

161102520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2659 (or 2646 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 161102520 is about 12692.6167514819. The cubic root of 161102520 is about 544.1276282871.

Adding to 161102520 its reverse (25201161), we get a palindrome (186303681).

The spelling of 161102520 in words is "one hundred sixty-one million, one hundred two thousand, five hundred twenty".