66222431 has 4 divisors (see below), whose sum is σ = 72242664. Its totient is φ = 60202200.

The previous prime is 66222419. The next prime is 66222433. The reversal of 66222431 is 13422266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66222431 is a prime.

It is a super-2 number, since 2×66222431² = 8770820735099522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66222431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66222433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3010100 + ... + 3010121.

It is an arithmetic number, because the mean of its divisors is an integer number (18060666).

Almost surely, 2^66222431 is an apocalyptic number.

66222431 is a deficient number, since it is larger than the sum of its proper divisors (6020233).

66222431 is a wasteful number, since it uses less digits than its factorization.

66222431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6020232.

The product of its digits is 3456, while the sum is 26.

The square root of 66222431 is about 8137.7165716188. The cubic root of 66222431 is about 404.5774814231.

Adding to 66222431 its reverse (13422266), we get a palindrome (79644697).

The spelling of 66222431 in words is "sixty-six million, two hundred twenty-two thousand, four hundred thirty-one".