664255215 has 32 divisors (see below), whose sum is σ = 1271739840. Its totient is φ = 327017088.

The previous prime is 664255211. The next prime is 664255223. The reversal of 664255215 is 512552466.

664255215 is a `hidden beast` number, since 6 + 642 + 5 + 5 + 2 + 1 + 5 = 666.

It is not a de Polignac number, because 664255215 - 2² = 664255211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664255215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664255211) 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, 187492 + ... + 191001.

It is an arithmetic number, because the mean of its divisors is an integer number (39741870).

Almost surely, 2^664255215 is an apocalyptic number.

664255215 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

664255215 is a deficient number, since it is larger than the sum of its proper divisors (607484625).

664255215 is a wasteful number, since it uses less digits than its factorization.

664255215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378520 (or 378514 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 664255215 is about 25773.1491091019. The cubic root of 664255215 is about 872.5258936549.

The spelling of 664255215 in words is "six hundred sixty-four million, two hundred fifty-five thousand, two hundred fifteen".