664413813 has 16 divisors (see below), whose sum is σ = 1124933760. Its totient is φ = 379664928.

The previous prime is 664413803. The next prime is 664413851. The reversal of 664413813 is 318314466.

It is a happy number.

664413813 is a `hidden beast` number, since 6 + 644 + 1 + 3 + 8 + 1 + 3 = 666.

It is not a de Polignac number, because 664413813 - 2⁵ = 664413781 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664413803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1757520 + ... + 1757897.

It is an arithmetic number, because the mean of its divisors is an integer number (70308360).

Almost surely, 2^664413813 is an apocalyptic number.

664413813 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

664413813 is a deficient number, since it is larger than the sum of its proper divisors (460519947).

664413813 is a wasteful number, since it uses less digits than its factorization.

664413813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3515433 (or 3515427 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 664413813 is about 25776.2257322518. The cubic root of 664413813 is about 872.5953297425.

The spelling of 664413813 in words is "six hundred sixty-four million, four hundred thirteen thousand, eight hundred thirteen".