666347320 has 64 divisors (see below), whose sum is σ = 1522825920. Its totient is φ = 262385664.

The previous prime is 666347267. The next prime is 666347359. The reversal of 666347320 is 23743666.

It is a self number, because there is not a number n which added to its sum of digits gives 666347320.

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, 1020114 + ... + 1020766.

It is an arithmetic number, because the mean of its divisors is an integer number (23794155).

Almost surely, 2^666347320 is an apocalyptic number.

It is an amenable number.

666347320 is an abundant number, since it is smaller than the sum of its proper divisors (856478600).

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

666347320 is a wasteful number, since it uses less digits than its factorization.

666347320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024 (or 1020 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 37.

The square root of 666347320 is about 25813.7041123509. The cubic root of 666347320 is about 873.4409549532.

The spelling of 666347320 in words is "six hundred sixty-six million, three hundred forty-seven thousand, three hundred twenty".