77525565957 has 24 divisors (see below), whose sum is σ = 128172982080. Its totient is φ = 44233076160.

The previous prime is 77525565911. The next prime is 77525565973. The reversal of 77525565957 is 75956552577.

77525565957 is a `hidden beast` number, since 7 + 7 + 525 + 5 + 6 + 59 + 57 = 666.

It is not a de Polignac number, because 77525565957 - 2⁷ = 77525565829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 77525565894 and 77525565903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77525561957) 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, 892144 + ... + 975177.

It is an arithmetic number, because the mean of its divisors is an integer number (5340540920).

Almost surely, 2^77525565957 is an apocalyptic number.

It is an amenable number.

77525565957 is a deficient number, since it is larger than the sum of its proper divisors (50647416123).

77525565957 is a wasteful number, since it uses less digits than its factorization.

77525565957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867993 (or 1867990 counting only the distinct ones).

The product of its digits is 115762500, while the sum is 63.

The spelling of 77525565957 in words is "seventy-seven billion, five hundred twenty-five million, five hundred sixty-five thousand, nine hundred fifty-seven".