66500111551660 has 96 divisors (see below), whose sum is σ = 149123278886400. Its totient is φ = 24836344404480.

The previous prime is 66500111551619. The next prime is 66500111551729. The reversal of 66500111551660 is 6615511100566.

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, 76270656 + ... + 77137624.

It is an arithmetic number, because the mean of its divisors is an integer number (1553367488400).

Almost surely, 2^{66500111551660} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66500111551660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74561639443200).

66500111551660 is an abundant number, since it is smaller than the sum of its proper divisors (82623167334740).

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

66500111551660 is a wasteful number, since it uses less digits than its factorization.

66500111551660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869911 (or 869909 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 66500111551660 in words is "sixty-six trillion, five hundred billion, one hundred eleven million, five hundred fifty-one thousand, six hundred sixty".