66661111612 has 12 divisors (see below), whose sum is σ = 116734779000. Its totient is φ = 33308317616.

The previous prime is 66661111597. The next prime is 66661111633. The reversal of 66661111612 is 21611116666.

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, 5552803 + ... + 5564794.

It is an arithmetic number, because the mean of its divisors is an integer number (9727898250).

Almost surely, 2^66661111612 is an apocalyptic number.

It is an amenable number.

66661111612 is a deficient number, since it is larger than the sum of its proper divisors (50073667388).

66661111612 is a wasteful number, since it uses less digits than its factorization.

66661111612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11119100 (or 11119098 counting only the distinct ones).

The product of its digits is 15552, while the sum is 37.

The spelling of 66661111612 in words is "sixty-six billion, six hundred sixty-one million, one hundred eleven thousand, six hundred twelve".