664651512 has 48 divisors (see below), whose sum is σ = 2057256240. Its totient is φ = 189900288.

The previous prime is 664651511. The next prime is 664651513. The reversal of 664651512 is 215156466.

664651512 is a `hidden beast` number, since 6 + 646 + 5 + 1 + 5 + 1 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (664651511) and next prime (664651513).

It is a super-2 number, since 2×664651512² = 883523264807772288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664651511) 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, 658873 + ... + 659880.

It is an arithmetic number, because the mean of its divisors is an integer number (42859505).

Almost surely, 2^664651512 is an apocalyptic number.

It is an amenable number.

664651512 is an abundant number, since it is smaller than the sum of its proper divisors (1392604728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664651512 is a wasteful number, since it uses less digits than its factorization.

664651512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318772 (or 1318765 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 664651512 is about 25780.8361384964. The cubic root of 664651512 is about 872.6993764994.

The spelling of 664651512 in words is "six hundred sixty-four million, six hundred fifty-one thousand, five hundred twelve".