77797679777 has 16 divisors (see below), whose sum is σ = 81039839040. Its totient is φ = 74593576512.

The previous prime is 77797679767. The next prime is 77797679797.

77797679777 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 77797679777 - 2⁸ = 77797679521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77797679747) 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, 6484178 + ... + 6496164.

It is an arithmetic number, because the mean of its divisors is an integer number (5064989940).

Almost surely, 2^77797679777 is an apocalyptic number.

It is an amenable number.

77797679777 is a deficient number, since it is larger than the sum of its proper divisors (3242159263).

77797679777 is a wasteful number, since it uses less digits than its factorization.

77797679777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13552.

The product of its digits is 2801693286, while the sum is 80.

The spelling of 77797679777 in words is "seventy-seven billion, seven hundred ninety-seven million, six hundred seventy-nine thousand, seven hundred seventy-seven".