157636661265 has 24 divisors (see below), whose sum is σ = 273998013120. Its totient is φ = 83838691104.

The previous prime is 157636661261. The next prime is 157636661267. The reversal of 157636661265 is 562166636751.

It is not a de Polignac number, because 157636661265 - 2² = 157636661261 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (157636661261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4862727 + ... + 4895036.

It is an arithmetic number, because the mean of its divisors is an integer number (11416583880).

Almost surely, 2^157636661265 is an apocalyptic number.

157636661265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

157636661265 is a deficient number, since it is larger than the sum of its proper divisors (116361351855).

157636661265 is a wasteful number, since it uses less digits than its factorization.

157636661265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9758133 (or 9758130 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 54.

The spelling of 157636661265 in words is "one hundred fifty-seven billion, six hundred thirty-six million, six hundred sixty-one thousand, two hundred sixty-five".