666512606320 has 40 divisors (see below), whose sum is σ = 1690518340080. Its totient is φ = 242368220160.

The previous prime is 666512606297. The next prime is 666512606327. The reversal of 666512606320 is 23606215666.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666512606327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378699465 + ... + 378701224.

It is an arithmetic number, because the mean of its divisors is an integer number (42262958502).

Almost surely, 2^666512606320 is an apocalyptic number.

It is an amenable number.

666512606320 is an abundant number, since it is smaller than the sum of its proper divisors (1024005733760).

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

666512606320 is a wasteful number, since it uses less digits than its factorization.

666512606320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757400713 (or 757400707 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 666512606320 in words is "six hundred sixty-six billion, five hundred twelve million, six hundred six thousand, three hundred twenty".