664222642 has 4 divisors (see below), whose sum is σ = 996333966. Its totient is φ = 332111320.

The previous prime is 664222633. The next prime is 664222651. The reversal of 664222642 is 246222466.

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

It is an interprime number because it is at equal distance from previous prime (664222633) and next prime (664222651).

It can be written as a sum of positive squares in only one way, i.e., 476505241 + 187717401 = 21829^2 + 13701^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664222598 and 664222607.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166055659 + ... + 166055662.

Almost surely, 2^664222642 is an apocalyptic number.

664222642 is a deficient number, since it is larger than the sum of its proper divisors (332111324).

664222642 is a wasteful number, since it uses less digits than its factorization.

664222642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332111323.

The product of its digits is 55296, while the sum is 34.

The square root of 664222642 is about 25772.5171840082. The cubic root of 664222642 is about 872.5116314407.

The spelling of 664222642 in words is "six hundred sixty-four million, two hundred twenty-two thousand, six hundred forty-two".