77916399361977 has 16 divisors (see below), whose sum is σ = 113333116605120. Its totient is φ = 47221988520000.

The previous prime is 77916399361961. The next prime is 77916399361979.

77916399361977 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 77916399361977 - 2⁴ = 77916399361961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77916399361977.

It is not an unprimeable number, because it can be changed into a prime (77916399361979) 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, 27335799 + ... + 30051267.

It is an arithmetic number, because the mean of its divisors is an integer number (7083319787820).

Almost surely, 2^{77916399361977} is an apocalyptic number.

It is an amenable number.

77916399361977 is a deficient number, since it is larger than the sum of its proper divisors (35416717243143).

77916399361977 is a wasteful number, since it uses less digits than its factorization.

77916399361977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584984.

The product of its digits is 5103959364, while the sum is 84.

The spelling of 77916399361977 in words is "seventy-seven trillion, nine hundred sixteen billion, three hundred ninety-nine million, three hundred sixty-one thousand, nine hundred seventy-seven".