157921696251 has 40 divisors (see below), whose sum is σ = 259902081648. Its totient is φ = 94762440000.

The previous prime is 157921696223. The next prime is 157921696271. The reversal of 157921696251 is 152696129751.

157921696251 is a `hidden beast` number, since 1 + 5 + 7 + 9 + 2 + 1 + 6 + 9 + 625 + 1 = 666.

It is not a de Polignac number, because 157921696251 - 2¹⁹ = 157921171963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157921696271) 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 39 ways as a sum of consecutive naturals, for example, 787440 + ... + 967421.

Almost surely, 2^157921696251 is an apocalyptic number.

157921696251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

157921696251 is a deficient number, since it is larger than the sum of its proper divisors (101980385397).

157921696251 is a wasteful number, since it uses less digits than its factorization.

157921696251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754985 (or 1754976 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 54.

The spelling of 157921696251 in words is "one hundred fifty-seven billion, nine hundred twenty-one million, six hundred ninety-six thousand, two hundred fifty-one".