77274776979 has 16 divisors (see below), whose sum is σ = 115316785440. Its totient is φ = 51140482560.

The previous prime is 77274776941. The next prime is 77274776993. The reversal of 77274776979 is 97967747277.

77274776979 is a `hidden beast` number, since 7 + 7 + 27 + 477 + 69 + 79 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-77274776979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77274796979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10441662 + ... + 10449059.

It is an arithmetic number, because the mean of its divisors is an integer number (7207299090).

Almost surely, 2^77274776979 is an apocalyptic number.

77274776979 is a deficient number, since it is larger than the sum of its proper divisors (38042008461).

77274776979 is a wasteful number, since it uses less digits than its factorization.

77274776979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20890867 (or 20890861 counting only the distinct ones).

The product of its digits is 457419312, while the sum is 72.

The spelling of 77274776979 in words is "seventy-seven billion, two hundred seventy-four million, seven hundred seventy-six thousand, nine hundred seventy-nine".