79977477997 has 8 divisors (see below), whose sum is σ = 80238161016. Its totient is φ = 79717220352.

The previous prime is 79977477989. The next prime is 79977478003.

79977477997 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 21377656521 + 58599821476 = 146211^2 + 242074^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 79977477997 - 2³ = 79977477989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79977477997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79977477947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272493 + ... + 483949.

It is an arithmetic number, because the mean of its divisors is an integer number (10029770127).

Almost surely, 2^79977477997 is an apocalyptic number.

It is an amenable number.

79977477997 is a deficient number, since it is larger than the sum of its proper divisors (260683019).

79977477997 is a wasteful number, since it uses less digits than its factorization.

79977477997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212687.

The product of its digits is 3087580356, while the sum is 82.

The spelling of 79977477997 in words is "seventy-nine billion, nine hundred seventy-seven million, four hundred seventy-seven thousand, nine hundred ninety-seven".