122157765121257 has 12 divisors (see below), whose sum is σ = 176458514641344. Its totient is φ = 81434628788760.

The previous prime is 122157765121253. The next prime is 122157765121291. The reversal of 122157765121257 is 752121567751221.

122157765121257 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 5 + 7 + 76 + 512 + 1 + 2 + 57 = 666.

It is not a de Polignac number, because 122157765121257 - 2² = 122157765121253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122157765121253) 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, 323241669 + ... + 323619362.

It is an arithmetic number, because the mean of its divisors is an integer number (14704876220112).

Almost surely, 2^{122157765121257} is an apocalyptic number.

It is an amenable number.

122157765121257 is a deficient number, since it is larger than the sum of its proper divisors (54300749520087).

122157765121257 is a wasteful number, since it uses less digits than its factorization.

122157765121257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646882020 (or 646882017 counting only the distinct ones).

The product of its digits is 4116000, while the sum is 54.

The spelling of 122157765121257 in words is "one hundred twenty-two trillion, one hundred fifty-seven billion, seven hundred sixty-five million, one hundred twenty-one thousand, two hundred fifty-seven".