663481972 has 12 divisors (see below), whose sum is σ = 1178423680. Its totient is φ = 326789496.

The previous prime is 663481927. The next prime is 663481979. The reversal of 663481972 is 279184366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663481979) 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, 1237572 + ... + 1238107.

Almost surely, 2^663481972 is an apocalyptic number.

It is an amenable number.

663481972 is a deficient number, since it is larger than the sum of its proper divisors (514941708).

663481972 is a wasteful number, since it uses less digits than its factorization.

663481972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2475750 (or 2475748 counting only the distinct ones).

The product of its digits is 435456, while the sum is 46.

The square root of 663481972 is about 25758.1437995831. The cubic root of 663481972 is about 872.1872002911.

The spelling of 663481972 in words is "six hundred sixty-three million, four hundred eighty-one thousand, nine hundred seventy-two".