668153808 has 90 divisors (see below), whose sum is σ = 2175215874. Its totient is φ = 190899072.

The previous prime is 668153803. The next prime is 668153809. The reversal of 668153808 is 808351866.

It can be written as a sum of positive squares in only one way, i.e., 525876624 + 142277184 = 22932^2 + 11928^2 .

It is a super-2 number, since 2×668153808² = 892859022289801728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668153803) 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 17 ways as a sum of consecutive naturals, for example, 40291 + ... + 54402.

Almost surely, 2^668153808 is an apocalyptic number.

It is an amenable number.

668153808 is an abundant number, since it is smaller than the sum of its proper divisors (1507062066).

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

668153808 is a wasteful number, since it uses less digits than its factorization.

668153808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94721 (or 94705 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 668153808 is about 25848.6713004750. The cubic root of 668153808 is about 874.2295511422.

The spelling of 668153808 in words is "six hundred sixty-eight million, one hundred fifty-three thousand, eight hundred eight".