668167774144 has 56 divisors (see below), whose sum is σ = 1430195249840. Its totient is φ = 307886690304.

The previous prime is 668167774133. The next prime is 668167774151. The reversal of 668167774144 is 441477761866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133689 + ... + 1163704.

It is an arithmetic number, because the mean of its divisors is an integer number (25539200890).

Almost surely, 2^668167774144 is an apocalyptic number.

668167774144 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

668167774144 is an abundant number, since it is smaller than the sum of its proper divisors (762027475696).

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

668167774144 is a wasteful number, since it uses less digits than its factorization.

668167774144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298037 (or 1298027 counting only the distinct ones).

The product of its digits is 37933056, while the sum is 61.

The spelling of 668167774144 in words is "six hundred sixty-eight billion, one hundred sixty-seven million, seven hundred seventy-four thousand, one hundred forty-four".