66617313994 has 64 divisors (see below), whose sum is σ = 127027180800. Its totient is φ = 25662531840.

The previous prime is 66617313979. The next prime is 66617314021. The reversal of 66617313994 is 49931371666.

66617313994 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-3 number, since 3×66617313994³ (a number of 33 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1638342 + ... + 1678510.

It is an arithmetic number, because the mean of its divisors is an integer number (1984799700).

Almost surely, 2^66617313994 is an apocalyptic number.

66617313994 is a deficient number, since it is larger than the sum of its proper divisors (60409866806).

66617313994 is a wasteful number, since it uses less digits than its factorization.

66617313994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40300 (or 40278 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 55.

The spelling of 66617313994 in words is "sixty-six billion, six hundred seventeen million, three hundred thirteen thousand, nine hundred ninety-four".