666702816 has 96 divisors (see below), whose sum is σ = 1889879040. Its totient is φ = 204578304.

The previous prime is 666702809. The next prime is 666702857. The reversal of 666702816 is 618207666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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, 896941 + ... + 897683.

It is an arithmetic number, because the mean of its divisors is an integer number (19686240).

Almost surely, 2^666702816 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 666702816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (944939520).

666702816 is an abundant number, since it is smaller than the sum of its proper divisors (1223176224).

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

666702816 is a wasteful number, since it uses less digits than its factorization.

666702816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488 (or 1480 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 666702816 is about 25820.5889940567. The cubic root of 666702816 is about 873.5962541266.

The spelling of 666702816 in words is "six hundred sixty-six million, seven hundred two thousand, eight hundred sixteen".