77995007979 has 16 divisors (see below), whose sum is σ = 118853442048. Its totient is φ = 44567111232.

The previous prime is 77995007941. The next prime is 77995007983. The reversal of 77995007979 is 97970059977.

It is not a de Polignac number, because 77995007979 - 2¹⁷ = 77994876907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77995107979) 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, 1180314 + ... + 1244640.

It is an arithmetic number, because the mean of its divisors is an integer number (7428340128).

Almost surely, 2^77995007979 is an apocalyptic number.

77995007979 is a deficient number, since it is larger than the sum of its proper divisors (40858434069).

77995007979 is a wasteful number, since it uses less digits than its factorization.

77995007979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122074.

The product of its (nonzero) digits is 78764805, while the sum is 69.

The spelling of 77995007979 in words is "seventy-seven billion, nine hundred ninety-five million, seven thousand, nine hundred seventy-nine".