668768137865070 has 64 divisors (see below), whose sum is σ = 1689609386983680. Its totient is φ = 168942962539008.

The previous prime is 668768137865033. The next prime is 668768137865099. The reversal of 668768137865070 is 70568731867866.

It is a super-2 number, since 2×668768137865070² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20481499 + ... + 41916918.

It is an arithmetic number, because the mean of its divisors is an integer number (26400146671620).

Almost surely, 2^{668768137865070} is an apocalyptic number.

668768137865070 is an abundant number, since it is smaller than the sum of its proper divisors (1020841249118610).

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

668768137865070 is a wasteful number, since it uses less digits than its factorization.

668768137865070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62417249.

The product of its (nonzero) digits is 3413975040, while the sum is 78.

The spelling of 668768137865070 in words is "six hundred sixty-eight trillion, seven hundred sixty-eight billion, one hundred thirty-seven million, eight hundred sixty-five thousand, seventy".