2565021725 has 48 divisors (see below), whose sum is σ = 3770949120. Its totient is φ = 1693440000.

The previous prime is 2565021721. The next prime is 2565021733. The reversal of 2565021725 is 5271205652.

It is not a de Polignac number, because 2565021725 - 2² = 2565021721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565021721) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 3415100 + ... + 3415850.

It is an arithmetic number, because the mean of its divisors is an integer number (78561440).

Almost surely, 2^2565021725 is an apocalyptic number.

2565021725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2565021725 is a deficient number, since it is larger than the sum of its proper divisors (1205927395).

2565021725 is a wasteful number, since it uses less digits than its factorization.

2565021725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470 (or 1465 counting only the distinct ones).

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

The square root of 2565021725 is about 50646.0435276044. The cubic root of 2565021725 is about 1368.8746552859.

The spelling of 2565021725 in words is "two billion, five hundred sixty-five million, twenty-one thousand, seven hundred twenty-five".