66917393512 has 64 divisors (see below), whose sum is σ = 130489545600. Its totient is φ = 32133024000.

The previous prime is 66917393441. The next prime is 66917393513. The reversal of 66917393512 is 21539371966.

It is a self number, because there is not a number n which added to its sum of digits gives 66917393512.

It is not an unprimeable number, because it can be changed into a prime (66917393513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48455062 + ... + 48456442.

It is an arithmetic number, because the mean of its divisors is an integer number (2038899150).

Almost surely, 2^66917393512 is an apocalyptic number.

It is an amenable number.

66917393512 is a deficient number, since it is larger than the sum of its proper divisors (63572152088).

66917393512 is a wasteful number, since it uses less digits than its factorization.

66917393512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378 (or 2374 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 52.

The spelling of 66917393512 in words is "sixty-six billion, nine hundred seventeen million, three hundred ninety-three thousand, five hundred twelve".