7929875665 has 4 divisors (see below), whose sum is σ = 9515850804. Its totient is φ = 6343900528.

The previous prime is 7929875647. The next prime is 7929875687. The reversal of 7929875665 is 5665789297.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1171555984 + 6758319681 = 34228^2 + 82209^2 .

It is a cyclic number.

It is not a de Polignac number, because 7929875665 - 2⁷ = 7929875537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7929875597 and 7929875606.

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, 792987562 + ... + 792987571.

It is an arithmetic number, because the mean of its divisors is an integer number (2378962701).

Almost surely, 2^7929875665 is an apocalyptic number.

It is an amenable number.

7929875665 is a deficient number, since it is larger than the sum of its proper divisors (1585975139).

7929875665 is a wasteful number, since it uses less digits than its factorization.

7929875665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585975138.

The product of its digits is 57153600, while the sum is 64.

The square root of 7929875665 is about 89049.8493260938. The cubic root of 7929875665 is about 1994.1391473965.

The spelling of 7929875665 in words is "seven billion, nine hundred twenty-nine million, eight hundred seventy-five thousand, six hundred sixty-five".