79856565 has 16 divisors (see below), whose sum is σ = 135286848. Its totient is φ = 40084736.

The previous prime is 79856551. The next prime is 79856587. The reversal of 79856565 is 56565897.

It is a cyclic number.

It is not a de Polignac number, because 79856565 - 2⁴ = 79856549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156327 + ... + 156836.

It is an arithmetic number, because the mean of its divisors is an integer number (8455428).

Almost surely, 2^79856565 is an apocalyptic number.

It is an amenable number.

79856565 is a deficient number, since it is larger than the sum of its proper divisors (55430283).

79856565 is a wasteful number, since it uses less digits than its factorization.

79856565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313188.

The product of its digits is 2268000, while the sum is 51.

The square root of 79856565 is about 8936.2500524549. The cubic root of 79856565 is about 430.6292661653.

The spelling of 79856565 in words is "seventy-nine million, eight hundred fifty-six thousand, five hundred sixty-five".