2157520625 has 20 divisors (see below), whose sum is σ = 2903436228. Its totient is φ = 1593240000.

The previous prime is 2157520619. The next prime is 2157520633. The reversal of 2157520625 is 5260257512.

It can be written as a sum of positive squares in 10 ways, for example, as 1942253041 + 215267584 = 44071^2 + 14672^2 .

It is not a de Polignac number, because 2157520625 - 2⁸ = 2157520369 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, 124646 + ... + 140895.

Almost surely, 2^2157520625 is an apocalyptic number.

2157520625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2157520625 is a deficient number, since it is larger than the sum of its proper divisors (745915603).

2157520625 is an equidigital number, since it uses as much as digits as its factorization.

2157520625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265574 (or 265559 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 2157520625 is about 46449.1186676346. The cubic root of 2157520625 is about 1292.1660272937.

The spelling of 2157520625 in words is "two billion, one hundred fifty-seven million, five hundred twenty thousand, six hundred twenty-five".