66859000660 has 24 divisors (see below), whose sum is σ = 140409972360. Its totient is φ = 26742443904.

The previous prime is 66859000639. The next prime is 66859000693. The reversal of 66859000660 is 6600095866.

66859000660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 36662292676 + 30196707984 = 191474^2 + 173772^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66859000660.

It is a congruent number.

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, 520362 + ... + 635998.

It is an arithmetic number, because the mean of its divisors is an integer number (5850415515).

Almost surely, 2^66859000660 is an apocalyptic number.

It is an amenable number.

66859000660 is an abundant number, since it is smaller than the sum of its proper divisors (73550971700).

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

66859000660 is a wasteful number, since it uses less digits than its factorization.

66859000660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144555 (or 144553 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 66859000660 in words is "sixty-six billion, eight hundred fifty-nine million, six hundred sixty", and thus it is an aban number.