663165725 has 12 divisors (see below), whose sum is σ = 825745140. Its totient is φ = 528326400.

The previous prime is 663165691. The next prime is 663165761. The reversal of 663165725 is 527561366.

It can be written as a sum of positive squares in 6 ways, for example, as 1338649 + 661827076 = 1157^2 + 25726^2 .

It is not a de Polignac number, because 663165725 - 2¹⁰ = 663164701 is a prime.

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, 49010 + ... + 61059.

It is an arithmetic number, because the mean of its divisors is an integer number (68812095).

Almost surely, 2^663165725 is an apocalyptic number.

It is an amenable number.

663165725 is a deficient number, since it is larger than the sum of its proper divisors (162579415).

663165725 is a wasteful number, since it uses less digits than its factorization.

663165725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110320 (or 110315 counting only the distinct ones).

The product of its digits is 226800, while the sum is 41.

The square root of 663165725 is about 25752.0042909285. The cubic root of 663165725 is about 872.0486029954.

The spelling of 663165725 in words is "six hundred sixty-three million, one hundred sixty-five thousand, seven hundred twenty-five".