79850665 has 4 divisors (see below), whose sum is σ = 95820804. Its totient is φ = 63880528.

The previous prime is 79850651. The next prime is 79850669. The reversal of 79850665 is 56605897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56605897 = 2251 ⋅25147.

It can be written as a sum of positive squares in 2 ways, for example, as 43718544 + 36132121 = 6612^2 + 6011^2 .

It is a cyclic number.

It is not a de Polignac number, because 79850665 - 2¹⁷ = 79719593 is a prime.

It is a super-2 number, since 2×79850665² = 12752257401884450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79850669) 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, 7985062 + ... + 7985071.

It is an arithmetic number, because the mean of its divisors is an integer number (23955201).

Almost surely, 2^79850665 is an apocalyptic number.

It is an amenable number.

79850665 is a deficient number, since it is larger than the sum of its proper divisors (15970139).

79850665 is a wasteful number, since it uses less digits than its factorization.

79850665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15970138.

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 79850665 is about 8935.9199302590. The cubic root of 79850665 is about 430.6186605867.

The spelling of 79850665 in words is "seventy-nine million, eight hundred fifty thousand, six hundred sixty-five".