663212725 has 12 divisors (see below), whose sum is σ = 939867424. Its totient is φ = 454774320.

The previous prime is 663212647. The next prime is 663212731. The reversal of 663212725 is 527212366.

It is not a de Polignac number, because 663212725 - 2⁹ = 663212213 is a prime.

It is a super-2 number, since 2×663212725² = 879702237203851250, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 1894719 + ... + 1895068.

Almost surely, 2^663212725 is an apocalyptic number.

It is an amenable number.

663212725 is a deficient number, since it is larger than the sum of its proper divisors (276654699).

663212725 is a wasteful number, since it uses less digits than its factorization.

663212725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3789804 (or 3789799 counting only the distinct ones).

The product of its digits is 30240, while the sum is 34.

The square root of 663212725 is about 25752.9168250899. The cubic root of 663212725 is about 872.0692038370.

The spelling of 663212725 in words is "six hundred sixty-three million, two hundred twelve thousand, seven hundred twenty-five".