66221436 has 12 divisors (see below), whose sum is σ = 154516712. Its totient is φ = 22073808.

The previous prime is 66221399. The next prime is 66221497. The reversal of 66221436 is 63412266.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2759215 + ... + 2759238.

Almost surely, 2^66221436 is an apocalyptic number.

It is an amenable number.

66221436 is an abundant number, since it is smaller than the sum of its proper divisors (88295276).

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

66221436 is a wasteful number, since it uses less digits than its factorization.

66221436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5518460 (or 5518458 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 66221436 is about 8137.6554363035. The cubic root of 66221436 is about 404.5754551378.

The spelling of 66221436 in words is "sixty-six million, two hundred twenty-one thousand, four hundred thirty-six".