77381685279 has 12 divisors (see below), whose sum is σ = 112274774976. Its totient is φ = 51356453472.

The previous prime is 77381685253. The next prime is 77381685287. The reversal of 77381685279 is 97258618377.

77381685279 is a `hidden beast` number, since 77 + 38 + 1 + 6 + 8 + 527 + 9 = 666.

It is not a de Polignac number, because 77381685279 - 2⁵ = 77381685247 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77381685239) 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, 19275942 + ... + 19279955.

It is an arithmetic number, because the mean of its divisors is an integer number (9356231248).

Almost surely, 2^77381685279 is an apocalyptic number.

77381685279 is a deficient number, since it is larger than the sum of its proper divisors (34893089697).

77381685279 is a wasteful number, since it uses less digits than its factorization.

77381685279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38556126 (or 38556123 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 63.

The spelling of 77381685279 in words is "seventy-seven billion, three hundred eighty-one million, six hundred eighty-five thousand, two hundred seventy-nine".