66007213939872 has 72 divisors (see below), whose sum is σ = 187725750013620. Its totient is φ = 22000325775360.

The previous prime is 66007213939871. The next prime is 66007213939879. The reversal of 66007213939872 is 27893931270066.

66007213939872 is a `hidden beast` number, since 6 + 600 + 7 + 2 + 13 + 9 + 3 + 9 + 8 + 7 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 60374205367056 + 5633008572816 = 7770084^2 + 2373396^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (66007213939871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7772529 + ... + 13871792.

Almost surely, 2^{66007213939872} is an apocalyptic number.

It is an amenable number.

66007213939872 is an abundant number, since it is smaller than the sum of its proper divisors (121718536073748).

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

66007213939872 is a wasteful number, since it uses less digits than its factorization.

66007213939872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21654926 (or 21654915 counting only the distinct ones).

The product of its (nonzero) digits is 41150592, while the sum is 63.

The spelling of 66007213939872 in words is "sixty-six trillion, seven billion, two hundred thirteen million, nine hundred thirty-nine thousand, eight hundred seventy-two".