77997679977 has 32 divisors (see below), whose sum is σ = 119772964864. Its totient is φ = 44226000000.

The previous prime is 77997679973. The next prime is 77997679993.

77997679977 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 77997679977 - 2² = 77997679973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77997679977.

It is not an unprimeable number, because it can be changed into a prime (77997679973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2958102 + ... + 2984352.

It is an arithmetic number, because the mean of its divisors is an integer number (3742905152).

Almost surely, 2^77997679977 is an apocalyptic number.

It is an amenable number.

77997679977 is a deficient number, since it is larger than the sum of its proper divisors (41775284887).

77997679977 is a wasteful number, since it uses less digits than its factorization.

77997679977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27349.

The product of its digits is 4631370534, while the sum is 84.

The spelling of 77997679977 in words is "seventy-seven billion, nine hundred ninety-seven million, six hundred seventy-nine thousand, nine hundred seventy-seven".