1645255625 has 20 divisors (see below), whose sum is σ = 2214069396. Its totient is φ = 1214952000.

The previous prime is 1645255613. The next prime is 1645255643. The reversal of 1645255625 is 5265525461.

It can be written as a sum of positive squares in 10 ways, for example, as 1421214601 + 224041024 = 37699^2 + 14968^2 .

It is not a de Polignac number, because 1645255625 - 2⁴ = 1645255609 is a prime.

It is a Duffinian number.

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 19 ways as a sum of consecutive naturals, for example, 93122 + ... + 109371.

Almost surely, 2^1645255625 is an apocalyptic number.

It is an amenable number.

1645255625 is a deficient number, since it is larger than the sum of its proper divisors (568813771).

1645255625 is an equidigital number, since it uses as much as digits as its factorization.

1645255625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202526 (or 202511 counting only the distinct ones).

The product of its digits is 360000, while the sum is 41.

The square root of 1645255625 is about 40561.7507634964. The cubic root of 1645255625 is about 1180.5320843213.

The spelling of 1645255625 in words is "one billion, six hundred forty-five million, two hundred fifty-five thousand, six hundred twenty-five".