156601610091 has 20 divisors (see below), whose sum is σ = 236251946304. Its totient is φ = 103367394000.

The previous prime is 156601610041. The next prime is 156601610159. The reversal of 156601610091 is 190016106651.

156601610091 is a `hidden beast` number, since 1 + 566 + 0 + 1 + 6 + 1 + 0 + 0 + 91 = 666.

It is not a de Polignac number, because 156601610091 - 2⁷ = 156601609963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (156601610041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9562875 + ... + 9579236.

Almost surely, 2^156601610091 is an apocalyptic number.

156601610091 is a deficient number, since it is larger than the sum of its proper divisors (79650336213).

156601610091 is a wasteful number, since it uses less digits than its factorization.

156601610091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19142224 (or 19142215 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The spelling of 156601610091 in words is "one hundred fifty-six billion, six hundred one million, six hundred ten thousand, ninety-one".