79925665 has 4 divisors (see below), whose sum is σ = 95910804. Its totient is φ = 63940528.

The previous prime is 79925611. The next prime is 79925693. The reversal of 79925665 is 56652997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56652997 = 229 ⋅247393.

It can be written as a sum of positive squares in 2 ways, for example, as 30813601 + 49112064 = 5551^2 + 7008^2 .

It is a cyclic number.

It is not a de Polignac number, because 79925665 - 2¹¹ = 79923617 is a prime.

It is a super-2 number, since 2×79925665² = 12776223851384450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7992562 + ... + 7992571.

It is an arithmetic number, because the mean of its divisors is an integer number (23977701).

Almost surely, 2^79925665 is an apocalyptic number.

It is an amenable number.

79925665 is a deficient number, since it is larger than the sum of its proper divisors (15985139).

79925665 is a wasteful number, since it uses less digits than its factorization.

79925665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15985138.

The product of its digits is 1020600, while the sum is 49.

The square root of 79925665 is about 8940.1154914240. The cubic root of 79925665 is about 430.7534383969.

The spelling of 79925665 in words is "seventy-nine million, nine hundred twenty-five thousand, six hundred sixty-five".