668557134 has 24 divisors (see below), whose sum is σ = 1655475120. Its totient is φ = 191016288.

The previous prime is 668557103. The next prime is 668557157. The reversal of 668557134 is 431755866.

668557134 is a `hidden beast` number, since 6 + 68 + 557 + 1 + 34 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 668557134.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2652879 + ... + 2653130.

It is an arithmetic number, because the mean of its divisors is an integer number (68978130).

Almost surely, 2^668557134 is an apocalyptic number.

668557134 is an abundant number, since it is smaller than the sum of its proper divisors (986917986).

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

668557134 is a wasteful number, since it uses less digits than its factorization.

668557134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5306024 (or 5306021 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 668557134 is about 25856.4718010791. The cubic root of 668557134 is about 874.4054231144.

The spelling of 668557134 in words is "six hundred sixty-eight million, five hundred fifty-seven thousand, one hundred thirty-four".