668001406680 has 128 divisors (see below), whose sum is σ = 2249627083200. Its totient is φ = 176297250816.

The previous prime is 668001406661. The next prime is 668001406697. The reversal of 668001406680 is 86604100866.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3083487 + ... + 3293006.

Almost surely, 2^668001406680 is an apocalyptic number.

668001406680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668001406680 is an abundant number, since it is smaller than the sum of its proper divisors (1581625676520).

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

668001406680 is a wasteful number, since it uses less digits than its factorization.

668001406680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6376610 (or 6376600 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 668001406680 in words is "six hundred sixty-eight billion, one million, four hundred six thousand, six hundred eighty".