666038616 has 64 divisors (see below), whose sum is σ = 1755868800. Its totient is φ = 209952000.

The previous prime is 666038587. The next prime is 666038707. The reversal of 666038616 is 616830666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 368916 + ... + 370716.

It is an arithmetic number, because the mean of its divisors is an integer number (27435450).

Almost surely, 2^666038616 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 666038616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (877934400).

666038616 is an abundant number, since it is smaller than the sum of its proper divisors (1089830184).

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

666038616 is a wasteful number, since it uses less digits than its factorization.

666038616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640 (or 2636 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 666038616 is about 25807.7239600861. The cubic root of 666038616 is about 873.3060521491.

The spelling of 666038616 in words is "six hundred sixty-six million, thirty-eight thousand, six hundred sixteen".