668011604660 has 24 divisors (see below), whose sum is σ = 1402860673536. Its totient is φ = 267197726880.

The previous prime is 668011604639. The next prime is 668011604677. The reversal of 668011604660 is 66406110866.

It is a happy number.

It is a congruent number.

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, 398945 + ... + 1222775.

It is an arithmetic number, because the mean of its divisors is an integer number (58452528064).

Almost surely, 2^668011604660 is an apocalyptic number.

It is an amenable number.

668011604660 is an abundant number, since it is smaller than the sum of its proper divisors (734849068876).

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

668011604660 is a wasteful number, since it uses less digits than its factorization.

668011604660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864383 (or 864381 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 668011604660 in words is "six hundred sixty-eight billion, eleven million, six hundred four thousand, six hundred sixty".