668265018 has 16 divisors (see below), whose sum is σ = 1346147040. Its totient is φ = 221152176.

The previous prime is 668265007. The next prime is 668265043. The reversal of 668265018 is 810562866.

It is an unprimeable number.

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, 399805 + ... + 401472.

It is an arithmetic number, because the mean of its divisors is an integer number (84134190).

Almost surely, 2^668265018 is an apocalyptic number.

668265018 is an abundant number, since it is smaller than the sum of its proper divisors (677882022).

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

668265018 is a wasteful number, since it uses less digits than its factorization.

668265018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801421.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 668265018 is about 25850.8223853710. The cubic root of 668265018 is about 874.2780517887.

The spelling of 668265018 in words is "six hundred sixty-eight million, two hundred sixty-five thousand, eighteen".