66221007 has 8 divisors (see below), whose sum is σ = 91339440. Its totient is φ = 42624960.

The previous prime is 66221003. The next prime is 66221021. The reversal of 66221007 is 70012266.

It is a happy number.

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

It is not a de Polignac number, because 66221007 - 2² = 66221003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66221003) 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, 380494 + ... + 380667.

It is an arithmetic number, because the mean of its divisors is an integer number (11417430).

Almost surely, 2^66221007 is an apocalyptic number.

66221007 is a deficient number, since it is larger than the sum of its proper divisors (25118433).

66221007 is a wasteful number, since it uses less digits than its factorization.

66221007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761193.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 66221007 is about 8137.6290773173. The cubic root of 66221007 is about 404.5745814869.

The spelling of 66221007 in words is "sixty-six million, two hundred twenty-one thousand, seven".