66756731372 has 6 divisors (see below), whose sum is σ = 116824279908. Its totient is φ = 33378365684.

The previous prime is 66756731351. The next prime is 66756731381. The reversal of 66756731372 is 27313765766.

66756731372 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 2×66756731372² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8344591418 + ... + 8344591425.

It is an arithmetic number, because the mean of its divisors is an integer number (19470713318).

Almost surely, 2^66756731372 is an apocalyptic number.

It is an amenable number.

66756731372 is a deficient number, since it is larger than the sum of its proper divisors (50067548536).

66756731372 is a wasteful number, since it uses less digits than its factorization.

66756731372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16689182847 (or 16689182845 counting only the distinct ones).

The product of its digits is 6667920, while the sum is 53.

The spelling of 66756731372 in words is "sixty-six billion, seven hundred fifty-six million, seven hundred thirty-one thousand, three hundred seventy-two".