668572416 has 108 divisors (see below), whose sum is σ = 1934973040. Its totient is φ = 222013440.

The previous prime is 668572357. The next prime is 668572417. The reversal of 668572416 is 614275866.

668572416 is a `hidden beast` number, since 6 + 68 + 572 + 4 + 16 = 666.

It is not an unprimeable number, because it can be changed into a prime (668572417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1011126 + ... + 1011786.

Almost surely, 2^668572416 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 668572416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (967486520).

668572416 is an abundant number, since it is smaller than the sum of its proper divisors (1266400624).

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

668572416 is a wasteful number, since it uses less digits than its factorization.

668572416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122 (or 1105 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 668572416 is about 25856.7673153471. The cubic root of 668572416 is about 874.4120855028.

The spelling of 668572416 in words is "six hundred sixty-eight million, five hundred seventy-two thousand, four hundred sixteen".