66221110 has 8 divisors (see below), whose sum is σ = 119198016. Its totient is φ = 26488440.

The previous prime is 66221107. The next prime is 66221119. The reversal of 66221110 is 1112266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66221119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3311046 + ... + 3311065.

It is an arithmetic number, because the mean of its divisors is an integer number (14899752).

Almost surely, 2^66221110 is an apocalyptic number.

66221110 is a deficient number, since it is larger than the sum of its proper divisors (52976906).

66221110 is a wasteful number, since it uses less digits than its factorization.

66221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6622118.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 66221110 is about 8137.6354059395. The cubic root of 66221110 is about 404.5747912450.

Adding to 66221110 its reverse (1112266), we get a palindrome (67333376).

The spelling of 66221110 in words is "sixty-six million, two hundred twenty-one thousand, one hundred ten".