663890604020 has 24 divisors (see below), whose sum is σ = 1593337449984. Its totient is φ = 227619635616.

The previous prime is 663890603993. The next prime is 663890604071. The reversal of 663890604020 is 20406098366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2371037732 + ... + 2371038011.

It is an arithmetic number, because the mean of its divisors is an integer number (66389060416).

Almost surely, 2^663890604020 is an apocalyptic number.

It is an amenable number.

663890604020 is an abundant number, since it is smaller than the sum of its proper divisors (929446845964).

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

663890604020 is a wasteful number, since it uses less digits than its factorization.

663890604020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742075759 (or 4742075757 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 663890604020 in words is "six hundred sixty-three billion, eight hundred ninety million, six hundred four thousand, twenty".