666365042404400 has 120 divisors (see below), whose sum is σ = 1636933887223824. Its totient is φ = 260619828019200.

The previous prime is 666365042404393. The next prime is 666365042404421. The reversal of 666365042404400 is 4404240563666.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100239581 + ... + 106680380.

Almost surely, 2^{666365042404400} is an apocalyptic number.

It is an amenable number.

666365042404400 is an abundant number, since it is smaller than the sum of its proper divisors (970568844819424).

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

666365042404400 is a wasteful number, since it uses less digits than its factorization.

666365042404400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206920159 (or 206920148 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 50.

The spelling of 666365042404400 in words is "six hundred sixty-six trillion, three hundred sixty-five billion, forty-two million, four hundred four thousand, four hundred".