79932977477 has 4 divisors (see below), whose sum is σ = 79937455200. Its totient is φ = 79928499756.

The previous prime is 79932977461. The next prime is 79932977507. The reversal of 79932977477 is 77477923997.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77477923997 = 17 ⋅4557524941.

It is a cyclic number.

It is not a de Polignac number, because 79932977477 - 2⁴ = 79932977461 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 79932977477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79932977407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2211977 + ... + 2247822.

It is an arithmetic number, because the mean of its divisors is an integer number (19984363800).

Almost surely, 2^79932977477 is an apocalyptic number.

It is an amenable number.

79932977477 is a deficient number, since it is larger than the sum of its proper divisors (4477723).

79932977477 is a wasteful number, since it uses less digits than its factorization.

79932977477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4477722.

The product of its digits is 294055272, while the sum is 71.

The spelling of 79932977477 in words is "seventy-nine billion, nine hundred thirty-two million, nine hundred seventy-seven thousand, four hundred seventy-seven".