77979957579 has 16 divisors (see below), whose sum is σ = 115533227040. Its totient is φ = 51983324640.

The previous prime is 77979957557. The next prime is 77979957589. The reversal of 77979957579 is 97575997977.

It is not a de Polignac number, because 77979957579 - 2⁸ = 77979957323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77979957498 and 77979957507.

It is not an unprimeable number, because it can be changed into a prime (77979957589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 384169 + ... + 550949.

It is an arithmetic number, because the mean of its divisors is an integer number (7220826690).

Almost surely, 2^77979957579 is an apocalyptic number.

77979957579 is a deficient number, since it is larger than the sum of its proper divisors (37553269461).

77979957579 is a wasteful number, since it uses less digits than its factorization.

77979957579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184107 (or 184101 counting only the distinct ones).

The product of its digits is 2756768175, while the sum is 81.

The spelling of 77979957579 in words is "seventy-seven billion, nine hundred seventy-nine million, nine hundred fifty-seven thousand, five hundred seventy-nine".