66947868233912 has 16 divisors (see below), whose sum is σ = 125928298479840. Its totient is φ = 33366988639296.

The previous prime is 66947868233899. The next prime is 66947868233927. The reversal of 66947868233912 is 21933286874966.

It is a happy number.

It is a super-2 number, since 2×66947868233912² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66947868233912.

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, 13368182048 + ... + 13368187055.

It is an arithmetic number, because the mean of its divisors is an integer number (7870518654990).

Almost surely, 2^{66947868233912} is an apocalyptic number.

It is an amenable number.

66947868233912 is a deficient number, since it is larger than the sum of its proper divisors (58980430245928).

66947868233912 is a wasteful number, since it uses less digits than its factorization.

66947868233912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26736369422 (or 26736369418 counting only the distinct ones).

The product of its digits is 1128701952, while the sum is 74.

The spelling of 66947868233912 in words is "sixty-six trillion, nine hundred forty-seven billion, eight hundred sixty-eight million, two hundred thirty-three thousand, nine hundred twelve".