77347256157 has 20 divisors (see below), whose sum is σ = 118230493920. Its totient is φ = 50365652904.

The previous prime is 77347256113. The next prime is 77347256159. The reversal of 77347256157 is 75165274377.

77347256157 is a `hidden beast` number, since 7 + 7 + 3 + 4 + 72 + 561 + 5 + 7 = 666.

It is not a de Polignac number, because 77347256157 - 2⁷ = 77347256029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77347256159) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11100057 + ... + 11107022.

It is an arithmetic number, because the mean of its divisors is an integer number (5911524696).

Almost surely, 2^77347256157 is an apocalyptic number.

It is an amenable number.

77347256157 is a deficient number, since it is larger than the sum of its proper divisors (40883237763).

77347256157 is a wasteful number, since it uses less digits than its factorization.

77347256157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22207134 (or 22207125 counting only the distinct ones).

The product of its digits is 8643600, while the sum is 54.

The spelling of 77347256157 in words is "seventy-seven billion, three hundred forty-seven million, two hundred fifty-six thousand, one hundred fifty-seven".