663131989 has 8 divisors (see below), whose sum is σ = 714355712. Its totient is φ = 611938800.

The previous prime is 663131941. The next prime is 663131993. The reversal of 663131989 is 989131366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 663131989 - 2²³ = 654743381 is a prime.

It is a super-2 number, since 2×663131989² = 879488069670192242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663131999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59212 + ... + 69514.

It is an arithmetic number, because the mean of its divisors is an integer number (89294464).

Almost surely, 2^663131989 is an apocalyptic number.

It is an amenable number.

663131989 is a deficient number, since it is larger than the sum of its proper divisors (51223723).

663131989 is a wasteful number, since it uses less digits than its factorization.

663131989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15267.

The product of its digits is 209952, while the sum is 46.

The square root of 663131989 is about 25751.3492656210. The cubic root of 663131989 is about 872.0338153743.

The spelling of 663131989 in words is "six hundred sixty-three million, one hundred thirty-one thousand, nine hundred eighty-nine".