668506890072 has 128 divisors (see below), whose sum is σ = 1916909660160. Its totient is φ = 190313840640.

The previous prime is 668506890043. The next prime is 668506890133. The reversal of 668506890072 is 270098605866.

It is a junction number, because it is equal to n+sod(n) for n = 668506889994 and 668506890021.

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, 93874672 + ... + 93881792.

It is an arithmetic number, because the mean of its divisors is an integer number (14975856720).

Almost surely, 2^668506890072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668506890072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (958454830080).

668506890072 is an abundant number, since it is smaller than the sum of its proper divisors (1248402770088).

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

668506890072 is a wasteful number, since it uses less digits than its factorization.

668506890072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9073 (or 9069 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 668506890072 in words is "six hundred sixty-eight billion, five hundred six million, eight hundred ninety thousand, seventy-two".