66221235 has 12 divisors (see below), whose sum is σ = 114783552. Its totient is φ = 35317968.

The previous prime is 66221227. The next prime is 66221237. The reversal of 66221235 is 53212266.

66221235 is a `hidden beast` number, since 6 + 622 + 1 + 2 + 35 = 666.

It is not a de Polignac number, because 66221235 - 2³ = 66221227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66221199 and 66221208.

It is not an unprimeable number, because it can be changed into a prime (66221237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 735747 + ... + 735836.

It is an arithmetic number, because the mean of its divisors is an integer number (9565296).

Almost surely, 2^66221235 is an apocalyptic number.

66221235 is a deficient number, since it is larger than the sum of its proper divisors (48562317).

66221235 is a wasteful number, since it uses less digits than its factorization.

66221235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471594 (or 1471591 counting only the distinct ones).

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

The square root of 66221235 is about 8137.6430862996. The cubic root of 66221235 is about 404.5750458054.

The spelling of 66221235 in words is "sixty-six million, two hundred twenty-one thousand, two hundred thirty-five".