78025477957 has 48 divisors (see below), whose sum is σ = 98665723200. Its totient is φ = 61314382080.

The previous prime is 78025477913. The next prime is 78025477961. The reversal of 78025477957 is 75977452087.

It is a de Polignac number, because none of the positive numbers 2^k-78025477957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78025477895 and 78025477904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78025477997) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4354657 + ... + 4372537.

It is an arithmetic number, because the mean of its divisors is an integer number (2055535900).

Almost surely, 2^78025477957 is an apocalyptic number.

It is an amenable number.

78025477957 is a deficient number, since it is larger than the sum of its proper divisors (20640245243).

78025477957 is a wasteful number, since it uses less digits than its factorization.

78025477957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18066 (or 18059 counting only the distinct ones).

The product of its (nonzero) digits is 34574400, while the sum is 61.

The spelling of 78025477957 in words is "seventy-eight billion, twenty-five million, four hundred seventy-seven thousand, nine hundred fifty-seven".