668920889088 has 72 divisors (see below), whose sum is σ = 1978116770000. Its totient is φ = 222973627392.

The previous prime is 668920889059. The next prime is 668920889101. The reversal of 668920889088 is 880988029866.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (72).

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, 48381463 + ... + 48395286.

Almost surely, 2^668920889088 is an apocalyptic number.

It is an amenable number.

668920889088 is an abundant number, since it is smaller than the sum of its proper divisors (1309195880912).

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

668920889088 is an equidigital number, since it uses as much as digits as its factorization.

668920889088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96776774 (or 96776754 counting only the distinct ones).

The product of its (nonzero) digits is 191102976, while the sum is 72.

The spelling of 668920889088 in words is "six hundred sixty-eight billion, nine hundred twenty million, eight hundred eighty-nine thousand, eighty-eight".