664920284644 has 72 divisors (see below), whose sum is σ = 1489305714624. Its totient is φ = 254171860800.

The previous prime is 664920284629. The next prime is 664920284681. The reversal of 664920284644 is 446482029466.

664920284644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1671922 + ... + 2031049.

It is an arithmetic number, because the mean of its divisors is an integer number (20684801592).

Almost surely, 2^664920284644 is an apocalyptic number.

It is an amenable number.

664920284644 is an abundant number, since it is smaller than the sum of its proper divisors (824385429980).

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

664920284644 is a wasteful number, since it uses less digits than its factorization.

664920284644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703057 (or 3703044 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 55.

The spelling of 664920284644 in words is "six hundred sixty-four billion, nine hundred twenty million, two hundred eighty-four thousand, six hundred forty-four".