66856018284 has 36 divisors (see below), whose sum is σ = 184360536360. Its totient is φ = 20259399360.

The previous prime is 66856018279. The next prime is 66856018297. The reversal of 66856018284 is 48281065866.

66856018284 is a `hidden beast` number, since 6 + 6 + 8 + 5 + 601 + 8 + 28 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66856018284.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84413769 + ... + 84414560.

It is an arithmetic number, because the mean of its divisors is an integer number (5121126010).

Almost surely, 2^66856018284 is an apocalyptic number.

It is an amenable number.

66856018284 is an abundant number, since it is smaller than the sum of its proper divisors (117504518076).

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

66856018284 is a wasteful number, since it uses less digits than its factorization.

66856018284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168828350 (or 168828345 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 54.

The spelling of 66856018284 in words is "sixty-six billion, eight hundred fifty-six million, eighteen thousand, two hundred eighty-four".