666516416 has 56 divisors (see below), whose sum is σ = 1410041376. Its totient is φ = 311500800.

The previous prime is 666516401. The next prime is 666516457. The reversal of 666516416 is 614615666.

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, 162260 + ... + 166316.

Almost surely, 2^666516416 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 666516416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (705020688).

666516416 is an abundant number, since it is smaller than the sum of its proper divisors (743524960).

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

666516416 is a wasteful number, since it uses less digits than its factorization.

666516416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4237 (or 4227 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 666516416 is about 25816.9792191108. The cubic root of 666516416 is about 873.5148317817.

The spelling of 666516416 in words is "six hundred sixty-six million, five hundred sixteen thousand, four hundred sixteen".