66555155612 has 12 divisors (see below), whose sum is σ = 127059842616. Its totient is φ = 30252343440.

The previous prime is 66555155587. The next prime is 66555155621. The reversal of 66555155612 is 21655155566.

It is a happy number.

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, 756308543 + ... + 756308630.

It is an arithmetic number, because the mean of its divisors is an integer number (10588320218).

Almost surely, 2^66555155612 is an apocalyptic number.

It is an amenable number.

66555155612 is a deficient number, since it is larger than the sum of its proper divisors (60504687004).

66555155612 is a wasteful number, since it uses less digits than its factorization.

66555155612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512617188 (or 1512617186 counting only the distinct ones).

The product of its digits is 1350000, while the sum is 47.

The spelling of 66555155612 in words is "sixty-six billion, five hundred fifty-five million, one hundred fifty-five thousand, six hundred twelve".