666607505712 has 40 divisors (see below), whose sum is σ = 1722457184256. Its totient is φ = 222152463936.

The previous prime is 666607505623. The next prime is 666607505741. The reversal of 666607505712 is 217505706666.

It is a super-2 number, since 2×666607505712² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1348008 + ... + 1774919.

Almost surely, 2^666607505712 is an apocalyptic number.

It is an amenable number.

666607505712 is an abundant number, since it is smaller than the sum of its proper divisors (1055849678544).

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

666607505712 is a wasteful number, since it uses less digits than its factorization.

666607505712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3127385 (or 3127379 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 51.

The spelling of 666607505712 in words is "six hundred sixty-six billion, six hundred seven million, five hundred five thousand, seven hundred twelve".