79906665 has 8 divisors (see below), whose sum is σ = 127850688. Its totient is φ = 42616880.

The previous prime is 79906621. The next prime is 79906693. The reversal of 79906665 is 56660997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79906665 - 2⁶ = 79906601 is a prime.

It is a super-2 number, since 2×79906665² = 12770150222844450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2663541 + ... + 2663570.

It is an arithmetic number, because the mean of its divisors is an integer number (15981336).

Almost surely, 2^79906665 is an apocalyptic number.

It is an amenable number.

79906665 is a deficient number, since it is larger than the sum of its proper divisors (47944023).

79906665 is a wasteful number, since it uses less digits than its factorization.

79906665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5327119.

The product of its (nonzero) digits is 612360, while the sum is 48.

The square root of 79906665 is about 8939.0528021709. The cubic root of 79906665 is about 430.7193026619.

The spelling of 79906665 in words is "seventy-nine million, nine hundred six thousand, six hundred sixty-five".