79221655 has 4 divisors (see below), whose sum is σ = 95065992. Its totient is φ = 63377320.

The previous prime is 79221619. The next prime is 79221677. The reversal of 79221655 is 55612297.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 79221655 - 2²¹ = 77124503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7922161 + ... + 7922170.

It is an arithmetic number, because the mean of its divisors is an integer number (23766498).

Almost surely, 2^79221655 is an apocalyptic number.

79221655 is a deficient number, since it is larger than the sum of its proper divisors (15844337).

79221655 is a wasteful number, since it uses less digits than its factorization.

79221655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15844336.

The product of its digits is 37800, while the sum is 37.

The square root of 79221655 is about 8900.6547511967. The cubic root of 79221655 is about 429.4849701762.

The spelling of 79221655 in words is "seventy-nine million, two hundred twenty-one thousand, six hundred fifty-five".