651630625 has 10 divisors (see below), whose sum is σ = 814278410. Its totient is φ = 521304000.

The previous prime is 651630619. The next prime is 651630649. The reversal of 651630625 is 526036156.

It can be written as a sum of positive squares in 5 ways, for example, as 68359824 + 583270801 = 8268^2 + 24151^2 .

It is not a de Polignac number, because 651630625 - 2⁹ = 651630113 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 520680 + ... + 521929.

It is an arithmetic number, because the mean of its divisors is an integer number (81427841).

Almost surely, 2^651630625 is an apocalyptic number.

It is an amenable number.

651630625 is a deficient number, since it is larger than the sum of its proper divisors (162647785).

651630625 is an equidigital number, since it uses as much as digits as its factorization.

651630625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042629 (or 1042614 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 651630625 is about 25527.0567241897. The cubic root of 651630625 is about 866.9628651447.

The spelling of 651630625 in words is "six hundred fifty-one million, six hundred thirty thousand, six hundred twenty-five".