8564664657 has 4 divisors (see below), whose sum is σ = 11419552880. Its totient is φ = 5709776436.

The previous prime is 8564664653. The next prime is 8564664697. The reversal of 8564664657 is 7564664658.

8564664657 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8564664657 - 2² = 8564664653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8564664597 and 8564664606.

It is not an unprimeable number, because it can be changed into a prime (8564664653) 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, 1427444107 + ... + 1427444112.

It is an arithmetic number, because the mean of its divisors is an integer number (2854888220).

Almost surely, 2^8564664657 is an apocalyptic number.

It is an amenable number.

8564664657 is a deficient number, since it is larger than the sum of its proper divisors (2854888223).

8564664657 is a wasteful number, since it uses less digits than its factorization.

8564664657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2854888222.

The product of its digits is 29030400, while the sum is 57.

The square root of 8564664657 is about 92545.4734549454. The cubic root of 8564664657 is about 2045.9897534577.

Subtracting from 8564664657 its reverse (7564664658), we obtain a palindrome (999999999).

The spelling of 8564664657 in words is "eight billion, five hundred sixty-four million, six hundred sixty-four thousand, six hundred fifty-seven".