663799525 has 12 divisors (see below), whose sum is σ = 826651332. Its totient is φ = 528755840.

The previous prime is 663799517. The next prime is 663799547. The reversal of 663799525 is 525997366.

663799525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 1920996 + 661878529 = 1386^2 + 25727^2 .

It is not a de Polignac number, because 663799525 - 2³ = 663799517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51154 + ... + 62803.

It is an arithmetic number, because the mean of its divisors is an integer number (68887611).

Almost surely, 2^663799525 is an apocalyptic number.

It is an amenable number.

663799525 is a deficient number, since it is larger than the sum of its proper divisors (162851807).

663799525 is a wasteful number, since it uses less digits than its factorization.

663799525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114200 (or 114195 counting only the distinct ones).

The product of its digits is 3061800, while the sum is 52.

The square root of 663799525 is about 25764.3071903748. The cubic root of 663799525 is about 872.3263256423.

The spelling of 663799525 in words is "six hundred sixty-three million, seven hundred ninety-nine thousand, five hundred twenty-five".