664822438872 has 32 divisors (see below), whose sum is σ = 1679190702000. Its totient is φ = 219322865664.

The previous prime is 664822438871. The next prime is 664822438873. The reversal of 664822438872 is 278834228466.

It is an interprime number because it is at equal distance from previous prime (664822438871) and next prime (664822438873).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664822438871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142785997 + ... + 142790652.

Almost surely, 2^664822438872 is an apocalyptic number.

It is an amenable number.

664822438872 is an abundant number, since it is smaller than the sum of its proper divisors (1014368263128).

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

664822438872 is a wasteful number, since it uses less digits than its factorization.

664822438872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285576755 (or 285576751 counting only the distinct ones).

The product of its digits is 49545216, while the sum is 60.

The spelling of 664822438872 in words is "six hundred sixty-four billion, eight hundred twenty-two million, four hundred thirty-eight thousand, eight hundred seventy-two".