79663557 has 4 divisors (see below), whose sum is σ = 106218080. Its totient is φ = 53109036.

The previous prime is 79663501. The next prime is 79663579. The reversal of 79663557 is 75536697.

It is a happy number.

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.

It is not a de Polignac number, because 79663557 - 2⁷ = 79663429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79663357) 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, 13277257 + ... + 13277262.

It is an arithmetic number, because the mean of its divisors is an integer number (26554520).

Almost surely, 2^79663557 is an apocalyptic number.

It is an amenable number.

79663557 is a deficient number, since it is larger than the sum of its proper divisors (26554523).

79663557 is a wasteful number, since it uses less digits than its factorization.

79663557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26554522.

The product of its digits is 1190700, while the sum is 48.

The square root of 79663557 is about 8925.4443586860. Note that the first 3 decimals coincide. The cubic root of 79663557 is about 430.2820521969.

The spelling of 79663557 in words is "seventy-nine million, six hundred sixty-three thousand, five hundred fifty-seven".