666746814012 has 12 divisors (see below), whose sum is σ = 1555742566056. Its totient is φ = 222248938000.

The previous prime is 666746814007. The next prime is 666746814029. The reversal of 666746814012 is 210418647666.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×666746814012² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27781117239 + ... + 27781117262.

It is an arithmetic number, because the mean of its divisors is an integer number (129645213838).

Almost surely, 2^666746814012 is an apocalyptic number.

It is an amenable number.

666746814012 is an abundant number, since it is smaller than the sum of its proper divisors (888995752044).

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

666746814012 is a wasteful number, since it uses less digits than its factorization.

666746814012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55562234508 (or 55562234506 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 666746814012 in words is "six hundred sixty-six billion, seven hundred forty-six million, eight hundred fourteen thousand, twelve".