668937491040 has 384 divisors, whose sum is σ = 2594852692992. Its totient is φ = 141060464640.

The previous prime is 668937491023. The next prime is 668937491051. The reversal of 668937491040 is 40194739866.

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 63 ways as a sum of consecutive naturals, for example, 114482359 + ... + 114488201.

It is an arithmetic number, because the mean of its divisors is an integer number (6757428888).

Almost surely, 2^668937491040 is an apocalyptic number.

668937491040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668937491040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1297426346496).

668937491040 is an abundant number, since it is smaller than the sum of its proper divisors (1925915201952).

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

668937491040 is a wasteful number, since it uses less digits than its factorization.

668937491040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8502 (or 8494 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 57.

The spelling of 668937491040 in words is "six hundred sixty-eight billion, nine hundred thirty-seven million, four hundred ninety-one thousand, forty".