2575251621 has 18 divisors (see below), whose sum is σ = 3925896390. Its totient is φ = 1626472656.

The previous prime is 2575251593. The next prime is 2575251631. The reversal of 2575251621 is 1261525752.

2575251621 is a `hidden beast` number, since 2 + 5 + 7 + 5 + 25 + 1 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2573532900 + 1718721 = 50730^2 + 1311^2 .

It is not a de Polignac number, because 2575251621 - 2⁷ = 2575251493 is a prime.

It is a super-2 number, since 2×2575251621² = 13263841822926255282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2575251631) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 393066 + ... + 399563.

It is an arithmetic number, because the mean of its divisors is an integer number (218105355).

Almost surely, 2^2575251621 is an apocalyptic number.

It is an amenable number.

2575251621 is a deficient number, since it is larger than the sum of its proper divisors (1350644769).

2575251621 is a wasteful number, since it uses less digits than its factorization.

2575251621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792673 (or 792651 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 2575251621 is about 50746.9370602798. The cubic root of 2575251621 is about 1370.6920369275.

The spelling of 2575251621 in words is "two billion, five hundred seventy-five million, two hundred fifty-one thousand, six hundred twenty-one".