664144390880 has 96 divisors (see below), whose sum is σ = 1662735392640. Its totient is φ = 250241044480.

The previous prime is 664144390859. The next prime is 664144390907. The reversal of 664144390880 is 88093441466.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1555304 + ... + 1935783.

It is an arithmetic number, because the mean of its divisors is an integer number (17320160340).

Almost surely, 2^664144390880 is an apocalyptic number.

It is an amenable number.

664144390880 is an abundant number, since it is smaller than the sum of its proper divisors (998591001760).

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

664144390880 is a wasteful number, since it uses less digits than its factorization.

664144390880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3491172 (or 3491164 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 53.

The spelling of 664144390880 in words is "six hundred sixty-four billion, one hundred forty-four million, three hundred ninety thousand, eight hundred eighty".