66660443992 has 16 divisors (see below), whose sum is σ = 125336494800. Its totient is φ = 33237378720.

The previous prime is 66660443987. The next prime is 66660444023. The reversal of 66660443992 is 29934406666.

66660443992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66660443992² (a number of 22 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, 11602359 + ... + 11608102.

It is an arithmetic number, because the mean of its divisors is an integer number (7833530925).

Almost surely, 2^66660443992 is an apocalyptic number.

It is an amenable number.

66660443992 is a deficient number, since it is larger than the sum of its proper divisors (58676050808).

66660443992 is a wasteful number, since it uses less digits than its factorization.

66660443992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23210826 (or 23210822 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 55.

The spelling of 66660443992 in words is "sixty-six billion, six hundred sixty million, four hundred forty-three thousand, nine hundred ninety-two".