663994131589 has 4 divisors (see below), whose sum is σ = 664007673600. Its totient is φ = 663980589580.

The previous prime is 663994131571. The next prime is 663994131607. The reversal of 663994131589 is 985131499366.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (663994131571) and next prime (663994131607).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663994131589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 663994131589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663994131289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6697189 + ... + 6795610.

It is an arithmetic number, because the mean of its divisors is an integer number (166001918400).

Almost surely, 2^663994131589 is an apocalyptic number.

It is an amenable number.

663994131589 is a deficient number, since it is larger than the sum of its proper divisors (13542011).

663994131589 is a wasteful number, since it uses less digits than its factorization.

663994131589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13542010.

The product of its digits is 37791360, while the sum is 64.

The spelling of 663994131589 in words is "six hundred sixty-three billion, nine hundred ninety-four million, one hundred thirty-one thousand, five hundred eighty-nine".