666331021064 has 64 divisors (see below), whose sum is σ = 1265003308800. Its totient is φ = 329025153600.

The previous prime is 666331021063. The next prime is 666331021093. The reversal of 666331021064 is 460120133666.

It is not an unprimeable number, because it can be changed into a prime (666331021061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276370019 + ... + 276372429.

It is an arithmetic number, because the mean of its divisors is an integer number (19765676700).

Almost surely, 2^666331021064 is an apocalyptic number.

It is an amenable number.

666331021064 is a deficient number, since it is larger than the sum of its proper divisors (598672287736).

666331021064 is a wasteful number, since it uses less digits than its factorization.

666331021064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3714 (or 3710 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 38.

The spelling of 666331021064 in words is "six hundred sixty-six billion, three hundred thirty-one million, twenty-one thousand, sixty-four".