66221471086444 has 6 divisors (see below), whose sum is σ = 115887574401284. Its totient is φ = 33110735543220.

The previous prime is 66221471086439. The next prime is 66221471086483. The reversal of 66221471086444 is 44468017412266.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8277683885802 + ... + 8277683885809.

Almost surely, 2^{66221471086444} is an apocalyptic number.

It is an amenable number.

66221471086444 is a deficient number, since it is larger than the sum of its proper divisors (49666103314840).

66221471086444 is a wasteful number, since it uses less digits than its factorization.

66221471086444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16555367771615 (or 16555367771613 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 55.

The spelling of 66221471086444 in words is "sixty-six trillion, two hundred twenty-one billion, four hundred seventy-one million, eighty-six thousand, four hundred forty-four".