66179221056 has 504 divisors, whose sum is σ = 212846655840. Its totient is φ = 19641802752.

The previous prime is 66179221039. The next prime is 66179221099. The reversal of 66179221056 is 65012297166.

66179221056 is a `hidden beast` number, since 6 + 617 + 9 + 2 + 21 + 0 + 5 + 6 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 476109435 + ... + 476109573.

Almost surely, 2^66179221056 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 66179221056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106423327920).

66179221056 is an abundant number, since it is smaller than the sum of its proper divisors (146667434784).

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

66179221056 is a wasteful number, since it uses less digits than its factorization.

66179221056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 66179221056 in words is "sixty-six billion, one hundred seventy-nine million, two hundred twenty-one thousand, fifty-six".