161500885 has 32 divisors (see below), whose sum is σ = 241597440. Its totient is φ = 100908288.

The previous prime is 161500879. The next prime is 161500891. The reversal of 161500885 is 588005161.

It is an interprime number because it is at equal distance from previous prime (161500879) and next prime (161500891).

It is not a de Polignac number, because 161500885 - 2⁵ = 161500853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161500885.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33699 + ... + 38191.

It is an arithmetic number, because the mean of its divisors is an integer number (7549920).

Almost surely, 2^161500885 is an apocalyptic number.

It is an amenable number.

161500885 is a deficient number, since it is larger than the sum of its proper divisors (80096555).

161500885 is a wasteful number, since it uses less digits than its factorization.

161500885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4597.

The product of its (nonzero) digits is 9600, while the sum is 34.

The square root of 161500885 is about 12708.2998469504. The cubic root of 161500885 is about 544.5757549058.

The spelling of 161500885 in words is "one hundred sixty-one million, five hundred thousand, eight hundred eighty-five".