161607657 has 8 divisors (see below), whose sum is σ = 215760160. Its totient is φ = 107596800.

The previous prime is 161607647. The next prime is 161607659. The reversal of 161607657 is 756706161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161607657 - 2²⁰ = 160559081 is a prime.

It is a super-2 number, since 2×161607657² = 52234069602059298, which contains 22 as substring.

It is the 12713-rd Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161607659) by changing a digit.

It is a nontrivial repunit in base 12712.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32719 + ... + 37332.

It is an arithmetic number, because the mean of its divisors is an integer number (26970020).

Almost surely, 2^161607657 is an apocalyptic number.

It is an amenable number.

161607657 is a deficient number, since it is larger than the sum of its proper divisors (54152503).

161607657 is an equidigital number, since it uses as much as digits as its factorization.

161607657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70823.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 161607657 is about 12712.5000294985. The cubic root of 161607657 is about 544.6957390438.

The spelling of 161607657 in words is "one hundred sixty-one million, six hundred seven thousand, six hundred fifty-seven".