663798975 has 48 divisors (see below), whose sum is σ = 1308820992. Its totient is φ = 290252160.

The previous prime is 663798973. The next prime is 663799007. The reversal of 663798975 is 579897366.

It is not a de Polignac number, because 663798975 - 2¹ = 663798973 is a prime.

It is a super-2 number, since 2×663798975² = 881258158422101250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663798973) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15412 + ... + 39561.

It is an arithmetic number, because the mean of its divisors is an integer number (27267104).

Almost surely, 2^663798975 is an apocalyptic number.

663798975 is a deficient number, since it is larger than the sum of its proper divisors (645022017).

663798975 is a wasteful number, since it uses less digits than its factorization.

663798975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55016 (or 55011 counting only the distinct ones).

The product of its digits is 17146080, while the sum is 60.

The square root of 663798975 is about 25764.2965166915. The cubic root of 663798975 is about 872.3260847163.

The spelling of 663798975 in words is "six hundred sixty-three million, seven hundred ninety-eight thousand, nine hundred seventy-five".