156611601 has 12 divisors (see below), whose sum is σ = 226420740. Its totient is φ = 104313600.

The previous prime is 156611573. The next prime is 156611617. The reversal of 156611601 is 106116651.

156611601 is a `hidden beast` number, since 1 + 56 + 6 + 1 + 1 + 601 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7160976 + 149450625 = 2676^2 + 12225^2 .

It is not a de Polignac number, because 156611601 - 2⁵ = 156611569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (156611671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3565 + ... + 18053.

It is an arithmetic number, because the mean of its divisors is an integer number (18868395).

Almost surely, 2^156611601 is an apocalyptic number.

It is an amenable number.

156611601 is a deficient number, since it is larger than the sum of its proper divisors (69809139).

156611601 is a wasteful number, since it uses less digits than its factorization.

156611601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15696 (or 15693 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 156611601 is about 12514.4556813311. The cubic root of 156611601 is about 539.0238434636.

The spelling of 156611601 in words is "one hundred fifty-six million, six hundred eleven thousand, six hundred one".