668618472 has 32 divisors (see below), whose sum is σ = 1675296000. Its totient is φ = 222372864.

The previous prime is 668618471. The next prime is 668618477. The reversal of 668618472 is 274816866.

It is a super-2 number, since 2×668618472² = 894101322199229568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668618471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20248 + ... + 41799.

It is an arithmetic number, because the mean of its divisors is an integer number (52353000).

Almost surely, 2^668618472 is an apocalyptic number.

It is an amenable number.

668618472 is an abundant number, since it is smaller than the sum of its proper divisors (1006677528).

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

668618472 is a wasteful number, since it uses less digits than its factorization.

668618472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62505 (or 62501 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 668618472 is about 25857.6578985801. The cubic root of 668618472 is about 874.4321636062.

The spelling of 668618472 in words is "six hundred sixty-eight million, six hundred eighteen thousand, four hundred seventy-two".