6631659225 has 81 divisors (see below), whose sum is σ = 12213162039. Its totient is φ = 3439814400.

The previous prime is 6631659173. The next prime is 6631659233. The reversal of 6631659225 is 5229561366.

The square root of 6631659225 is 81435.

It is a perfect power (a square), and thus also a powerful number.

6631659225 is a `hidden beast` number, since 6 + 6 + 31 + 6 + 592 + 25 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 6080724441 + 550934784 = 77979^2 + 23472^2 .

It is not a de Polignac number, because 6631659225 - 2¹⁵ = 6631626457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 80 ways as a sum of consecutive naturals, for example, 74512981 + ... + 74513069.

Almost surely, 2^6631659225 is an apocalyptic number.

6631659225 is the 81435-th square number.

6631659225 is the 40718-th centered octagonal number.

It is an amenable number.

6631659225 is a deficient number, since it is larger than the sum of its proper divisors (5581502814).

6631659225 is an equidigital number, since it uses as much as digits as its factorization.

6631659225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 158 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The cubic root of 6631659225 is about 1878.7719481953.

It can be divided in two parts, 6631 and 659225, that added together give a square (665856 = 816²).

The spelling of 6631659225 in words is "six billion, six hundred thirty-one million, six hundred fifty-nine thousand, two hundred twenty-five".