668535625 has 20 divisors (see below), whose sum is σ = 884557476. Its totient is φ = 503360000.

The previous prime is 668535617. The next prime is 668535629. The reversal of 668535625 is 526535866.

668535625 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 10 ways, for example, as 393506569 + 275029056 = 19837^2 + 16584^2 .

It is not a de Polignac number, because 668535625 - 2³ = 668535617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668535629) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20836 + ... + 42085.

Almost surely, 2^668535625 is an apocalyptic number.

It is an amenable number.

668535625 is a deficient number, since it is larger than the sum of its proper divisors (216021851).

668535625 is an equidigital number, since it uses as much as digits as its factorization.

668535625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62958 (or 62943 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 46.

The square root of 668535625 is about 25856.0558670498. The cubic root of 668535625 is about 874.3960458116.

The spelling of 668535625 in words is "six hundred sixty-eight million, five hundred thirty-five thousand, six hundred twenty-five".