66213822 has 32 divisors (see below), whose sum is σ = 141494400. Its totient is φ = 20595168.

The previous prime is 66213821. The next prime is 66213839. The reversal of 66213822 is 22831266.

It is a self number, because there is not a number n which added to its sum of digits gives 66213822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66213821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3304 + ... + 11972.

It is an arithmetic number, because the mean of its divisors is an integer number (4421700).

Almost surely, 2^66213822 is an apocalyptic number.

66213822 is an abundant number, since it is smaller than the sum of its proper divisors (75280578).

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

66213822 is a wasteful number, since it uses less digits than its factorization.

66213822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8760.

The product of its digits is 6912, while the sum is 30.

The square root of 66213822 is about 8137.1875976900. The cubic root of 66213822 is about 404.5599488014.

The spelling of 66213822 in words is "sixty-six million, two hundred thirteen thousand, eight hundred twenty-two".