66221799502 has 16 divisors (see below), whose sum is σ = 103693841280. Its totient is φ = 31658361592.

The previous prime is 66221799499. The next prime is 66221799509. The reversal of 66221799502 is 20599712266.

66221799502 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66221799509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179608 + ... + 405835.

It is an arithmetic number, because the mean of its divisors is an integer number (6480865080).

Almost surely, 2^66221799502 is an apocalyptic number.

66221799502 is a deficient number, since it is larger than the sum of its proper divisors (37472041778).

66221799502 is a wasteful number, since it uses less digits than its factorization.

66221799502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587927.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 66221799502 in words is "sixty-six billion, two hundred twenty-one million, seven hundred ninety-nine thousand, five hundred two".