6564613923 has 32 divisors (see below), whose sum is σ = 11239603200. Its totient is φ = 3709050048.

The previous prime is 6564613919. The next prime is 6564613927. The reversal of 6564613923 is 3293164656.

6564613923 is a `hidden beast` number, since 6 + 5 + 6 + 4 + 613 + 9 + 23 = 666.

It is an interprime number because it is at equal distance from previous prime (6564613919) and next prime (6564613927).

It is not a de Polignac number, because 6564613923 - 2² = 6564613919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6564613927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178311 + ... + 211952.

It is an arithmetic number, because the mean of its divisors is an integer number (351237600).

Almost surely, 2^6564613923 is an apocalyptic number.

6564613923 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

6564613923 is a deficient number, since it is larger than the sum of its proper divisors (4674989277).

6564613923 is a wasteful number, since it uses less digits than its factorization.

6564613923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390368 (or 390362 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 6564613923 is about 81022.3050955723. The cubic root of 6564613923 is about 1872.4191025197.

The spelling of 6564613923 in words is "six billion, five hundred sixty-four million, six hundred thirteen thousand, nine hundred twenty-three".