663982525 has 6 divisors (see below), whose sum is σ = 823338362. Its totient is φ = 531186000.

The previous prime is 663982513. The next prime is 663982537. The reversal of 663982525 is 525289366.

It is an interprime number because it is at equal distance from previous prime (663982513) and next prime (663982537).

It can be written as a sum of positive squares in 3 ways, for example, as 42328036 + 621654489 = 6506^2 + 24933^2 .

It is not a de Polignac number, because 663982525 - 2⁹ = 663982013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13279626 + ... + 13279675.

Almost surely, 2^663982525 is an apocalyptic number.

It is an amenable number.

663982525 is a deficient number, since it is larger than the sum of its proper divisors (159355837).

663982525 is a wasteful number, since it uses less digits than its factorization.

663982525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26559311 (or 26559306 counting only the distinct ones).

The product of its digits is 777600, while the sum is 46.

The square root of 663982525 is about 25767.8583704583. The cubic root of 663982525 is about 872.4064808920.

The spelling of 663982525 in words is "six hundred sixty-three million, nine hundred eighty-two thousand, five hundred twenty-five".