663923107648 has 28 divisors (see below), whose sum is σ = 1349605895652. Its totient is φ = 323864929280.

The previous prime is 663923107621. The next prime is 663923107663. The reversal of 663923107648 is 846701329366.

It can be written as a sum of positive squares in 2 ways, for example, as 371553640704 + 292369466944 = 609552^2 + 540712^2 .

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126507115 + ... + 126512362.

It is an arithmetic number, because the mean of its divisors is an integer number (48200210559).

Almost surely, 2^663923107648 is an apocalyptic number.

It is an amenable number.

663923107648 is an abundant number, since it is smaller than the sum of its proper divisors (685682788004).

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

663923107648 is a wasteful number, since it uses less digits than its factorization.

663923107648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253019530 (or 253019520 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 55.

The spelling of 663923107648 in words is "six hundred sixty-three billion, nine hundred twenty-three million, one hundred seven thousand, six hundred forty-eight".