666699328512 has 1056 divisors, whose sum is σ = 2389686534144. Its totient is φ = 175000780800.

The previous prime is 666699328483. The next prime is 666699328531. The reversal of 666699328512 is 215823996666.

It is a super-2 number, since 2×666699328512² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 666699328512.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3853753258 + ... + 3853753430.

Almost surely, 2^666699328512 is an apocalyptic number.

666699328512 is a gapful number since it is divisible by the number (62) 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 666699328512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1194843267072).

666699328512 is an abundant number, since it is smaller than the sum of its proper divisors (1722987205632).

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

666699328512 is a wasteful number, since it uses less digits than its factorization.

666699328512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 304 counting only the distinct ones).

The product of its digits is 50388480, while the sum is 63.

The spelling of 666699328512 in words is "six hundred sixty-six billion, six hundred ninety-nine million, three hundred twenty-eight thousand, five hundred twelve".