668913681146 has 16 divisors (see below), whose sum is σ = 1004081218560. Its totient is φ = 334220026800.

The previous prime is 668913681127. The next prime is 668913681221. The reversal of 668913681146 is 641186319866.

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, 18399575 + ... + 18435893.

It is an arithmetic number, because the mean of its divisors is an integer number (62755076160).

Almost surely, 2^668913681146 is an apocalyptic number.

668913681146 is a deficient number, since it is larger than the sum of its proper divisors (335167537414).

668913681146 is a wasteful number, since it uses less digits than its factorization.

668913681146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42589.

The product of its digits is 8957952, while the sum is 59.

The spelling of 668913681146 in words is "six hundred sixty-eight billion, nine hundred thirteen million, six hundred eighty-one thousand, one hundred forty-six".