66221532 has 36 divisors (see below), whose sum is σ = 180271000. Its totient is φ = 20375712.

The previous prime is 66221497. The next prime is 66221537. The reversal of 66221532 is 23512266.

66221532 is a `hidden beast` number, since 6 + 622 + 1 + 5 + 32 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 66221496 and 66221505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66221537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70282 + ... + 71217.

Almost surely, 2^66221532 is an apocalyptic number.

It is an amenable number.

66221532 is an abundant number, since it is smaller than the sum of its proper divisors (114049468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66221532 is a wasteful number, since it uses less digits than its factorization.

66221532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141522 (or 141517 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 66221532 is about 8137.6613348062. The cubic root of 66221532 is about 404.5756506396.

Adding to 66221532 its reverse (23512266), we get a palindrome (89733798).

The spelling of 66221532 in words is "sixty-six million, two hundred twenty-one thousand, five hundred thirty-two".