161959500 has 288 divisors, whose sum is σ = 559663104. Its totient is φ = 40824000.

The previous prime is 161959487. The next prime is 161959517. The reversal of 161959500 is 5959161.

161959500 is a `hidden beast` number, since 1 + 61 + 9 + 595 + 0 + 0 = 666.

161959500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3766479 + ... + 3766521.

Almost surely, 2^161959500 is an apocalyptic number.

161959500 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 161959500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279831552).

161959500 is an abundant number, since it is smaller than the sum of its proper divisors (397703604).

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

161959500 is a wasteful number, since it uses less digits than its factorization.

161959500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 36.

The square root of 161959500 is about 12726.3309716509. The cubic root of 161959500 is about 545.0907460486.

The spelling of 161959500 in words is "one hundred sixty-one million, nine hundred fifty-nine thousand, five hundred".