77993397955 has 8 divisors (see below), whose sum is σ = 102100448304. Its totient is φ = 56722471200.

The previous prime is 77993397899. The next prime is 77993397971. The reversal of 77993397955 is 55979339977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77993397955 - 2²⁵ = 77959843523 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 709030836 + ... + 709030945.

It is an arithmetic number, because the mean of its divisors is an integer number (12762556038).

Almost surely, 2^77993397955 is an apocalyptic number.

77993397955 is a deficient number, since it is larger than the sum of its proper divisors (24107050349).

77993397955 is a wasteful number, since it uses less digits than its factorization.

77993397955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418061797.

The product of its digits is 506345175, while the sum is 73.

The spelling of 77993397955 in words is "seventy-seven billion, nine hundred ninety-three million, three hundred ninety-seven thousand, nine hundred fifty-five".