157121557211511 has 6 divisors (see below), whose sum is σ = 226953360416640. Its totient is φ = 104747704807668.

The previous prime is 157121557211497. The next prime is 157121557211539. The reversal of 157121557211511 is 115112755121751.

157121557211511 is a `hidden beast` number, since 1 + 5 + 7 + 1 + 2 + 1 + 55 + 72 + 11 + 511 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-157121557211511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157121557210511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8728975400631 + ... + 8728975400648.

It is an arithmetic number, because the mean of its divisors is an integer number (37825560069440).

Almost surely, 2^{157121557211511} is an apocalyptic number.

157121557211511 is a deficient number, since it is larger than the sum of its proper divisors (69831803205129).

157121557211511 is a wasteful number, since it uses less digits than its factorization.

157121557211511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17457950801285 (or 17457950801282 counting only the distinct ones).

The product of its digits is 122500, while the sum is 45.

The spelling of 157121557211511 in words is "one hundred fifty-seven trillion, one hundred twenty-one billion, five hundred fifty-seven million, two hundred eleven thousand, five hundred eleven".