66221374466 has 16 divisors (see below), whose sum is σ = 106981051128. Its totient is φ = 30561408000.

The previous prime is 66221374423. The next prime is 66221374477. The reversal of 66221374466 is 66447312266.

It can be written as a sum of positive squares in 4 ways, for example, as 10798327225 + 55423047241 = 103915^2 + 235421^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66221374466.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284066 + ... + 461666.

Almost surely, 2^66221374466 is an apocalyptic number.

66221374466 is a deficient number, since it is larger than the sum of its proper divisors (40759676662).

66221374466 is a wasteful number, since it uses less digits than its factorization.

66221374466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191957.

The product of its digits is 1741824, while the sum is 47.

The spelling of 66221374466 in words is "sixty-six billion, two hundred twenty-one million, three hundred seventy-four thousand, four hundred sixty-six".