66264868442 has 4 divisors (see below), whose sum is σ = 99397302666. Its totient is φ = 33132434220.

The previous prime is 66264868363. The next prime is 66264868471. The reversal of 66264868442 is 24486846266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24486846266 = 2 ⋅12243423133.

It can be written as a sum of positive squares in only one way, i.e., 44458144201 + 21806724241 = 210851^2 + 147671^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16566217109 + ... + 16566217112.

Almost surely, 2^66264868442 is an apocalyptic number.

66264868442 is a deficient number, since it is larger than the sum of its proper divisors (33132434224).

66264868442 is a wasteful number, since it uses less digits than its factorization.

66264868442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33132434223.

The product of its digits is 21233664, while the sum is 56.

The spelling of 66264868442 in words is "sixty-six billion, two hundred sixty-four million, eight hundred sixty-eight thousand, four hundred forty-two".