666392064 has 160 divisors (see below), whose sum is σ = 1996372224. Its totient is φ = 195993600.

The previous prime is 666392063. The next prime is 666392071. The reversal of 666392064 is 460293666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666392063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 458539 + ... + 459989.

Almost surely, 2^666392064 is an apocalyptic number.

666392064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666392064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (998186112).

666392064 is an abundant number, since it is smaller than the sum of its proper divisors (1329980160).

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

666392064 is a wasteful number, since it uses less digits than its factorization.

666392064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508 (or 1492 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 42.

The square root of 666392064 is about 25814.5707692381. The cubic root of 666392064 is about 873.4605045015.

The spelling of 666392064 in words is "six hundred sixty-six million, three hundred ninety-two thousand, sixty-four".