66505007611660 has 24 divisors (see below), whose sum is σ = 144476395847280. Its totient is φ = 25684692594624.

The previous prime is 66505007611649. The next prime is 66505007611687. The reversal of 66505007611660 is 6611670050566.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57331902534 + ... + 57331903693.

It is an arithmetic number, because the mean of its divisors is an integer number (6019849826970).

Almost surely, 2^{66505007611660} is an apocalyptic number.

It is an amenable number.

66505007611660 is an abundant number, since it is smaller than the sum of its proper divisors (77971388235620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66505007611660 is a wasteful number, since it uses less digits than its factorization.

66505007611660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114663806265 (or 114663806263 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 66505007611660 in words is "sixty-six trillion, five hundred five billion, seven million, six hundred eleven thousand, six hundred sixty".