642222967 has 4 divisors (see below), whose sum is σ = 642283120. Its totient is φ = 642162816.

The previous prime is 642222947. The next prime is 642222979. The reversal of 642222967 is 769222246.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642222967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642222947) by changing a digit.

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, 9258 + ... + 37015.

It is an arithmetic number, because the mean of its divisors is an integer number (160570780).

Almost surely, 2^642222967 is an apocalyptic number.

642222967 is a deficient number, since it is larger than the sum of its proper divisors (60153).

642222967 is a wasteful number, since it uses less digits than its factorization.

642222967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60152.

The product of its digits is 145152, while the sum is 40.

The square root of 642222967 is about 25342.1184394675. The cubic root of 642222967 is about 862.7704807916.

The spelling of 642222967 in words is "six hundred forty-two million, two hundred twenty-two thousand, nine hundred sixty-seven".