77666012379 has 20 divisors (see below), whose sum is σ = 116210808384. Its totient is φ = 51692008464.

The previous prime is 77666012363. The next prime is 77666012383. The reversal of 77666012379 is 97321066677.

It is not a de Polignac number, because 77666012379 - 2⁴ = 77666012363 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (77666012279) 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, 740652 + ... + 838985.

Almost surely, 2^77666012379 is an apocalyptic number.

77666012379 is a deficient number, since it is larger than the sum of its proper divisors (38544796005).

77666012379 is a wasteful number, since it uses less digits than its factorization.

77666012379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580256 (or 1580247 counting only the distinct ones).

The product of its (nonzero) digits is 4000752, while the sum is 54.

The spelling of 77666012379 in words is "seventy-seven billion, six hundred sixty-six million, twelve thousand, three hundred seventy-nine".