66666012 has 48 divisors (see below), whose sum is σ = 183912960. Its totient is φ = 18389952.

The previous prime is 66666011. The next prime is 66666013. The reversal of 66666012 is 21066666.

It is an interprime number because it is at equal distance from previous prime (66666011) and next prime (66666013).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11248 + ... + 16119.

It is an arithmetic number, because the mean of its divisors is an integer number (3831520).

Almost surely, 2^66666012 is an apocalyptic number.

It is an amenable number.

66666012 is an abundant number, since it is smaller than the sum of its proper divisors (117246948).

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

66666012 is a wasteful number, since it uses less digits than its factorization.

66666012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27410 (or 27408 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 66666012 is about 8164.9257191967. The cubic root of 66666012 is about 405.4788057622.

The spelling of 66666012 in words is "sixty-six million, six hundred sixty-six thousand, twelve".