64256566 has 24 divisors (see below), whose sum is σ = 112182840. Its totient is φ = 27487680.

The previous prime is 64256561. The next prime is 64256579. The reversal of 64256566 is 66565246.

It is a super-2 number, since 2×64256566² = 8257812548224712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64256561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3696 + ... + 11923.

It is an arithmetic number, because the mean of its divisors is an integer number (4674285).

Almost surely, 2^64256566 is an apocalyptic number.

64256566 is a deficient number, since it is larger than the sum of its proper divisors (47926274).

64256566 is a wasteful number, since it uses less digits than its factorization.

64256566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15660 (or 15649 counting only the distinct ones).

The product of its digits is 259200, while the sum is 40.

The square root of 64256566 is about 8016.0193363040. The cubic root of 64256566 is about 400.5337998275.

The spelling of 64256566 in words is "sixty-four million, two hundred fifty-six thousand, five hundred sixty-six".