8138790565 has 16 divisors (see below), whose sum is σ = 9888758640. Its totient is φ = 6429744640.

The previous prime is 8138790553. The next prime is 8138790599. The reversal of 8138790565 is 5650978318.

It can be written as a sum of positive squares in 8 ways, for example, as 236113956 + 7902676609 = 15366^2 + 88897^2 .

It is not a de Polignac number, because 8138790565 - 2⁵ = 8138790533 is a prime.

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, 354207 + ... + 376483.

It is an arithmetic number, because the mean of its divisors is an integer number (618047415).

Almost surely, 2^8138790565 is an apocalyptic number.

It is an amenable number.

8138790565 is a deficient number, since it is larger than the sum of its proper divisors (1749968075).

8138790565 is a wasteful number, since it uses less digits than its factorization.

8138790565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23192.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The square root of 8138790565 is about 90215.2457459381. The cubic root of 8138790565 is about 2011.4996329107.

The spelling of 8138790565 in words is "eight billion, one hundred thirty-eight million, seven hundred ninety thousand, five hundred sixty-five".