161156245500 has 144 divisors (see below), whose sum is σ = 510233540544. Its totient is φ = 42819523200.

The previous prime is 161156245447. The next prime is 161156245501. The reversal of 161156245500 is 5542651161.

161156245500 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 562 + 45 + 50 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161156245501) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1181857 + ... + 1311143.

It is an arithmetic number, because the mean of its divisors is an integer number (3543288476).

Almost surely, 2^161156245500 is an apocalyptic number.

161156245500 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 161156245500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255116770272).

161156245500 is an abundant number, since it is smaller than the sum of its proper divisors (349077295044).

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

161156245500 is a wasteful number, since it uses less digits than its factorization.

161156245500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129589 (or 129574 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 161156245500 its reverse (5542651161), we get a palindrome (166698896661).

The spelling of 161156245500 in words is "one hundred sixty-one billion, one hundred fifty-six million, two hundred forty-five thousand, five hundred".