2581398625 has 64 divisors (see below), whose sum is σ = 3599511552. Its totient is φ = 1836172800.

The previous prime is 2581398593. The next prime is 2581398637. The reversal of 2581398625 is 5268931852.

It is a happy number.

It is not a de Polignac number, because 2581398625 - 2⁵ = 2581398593 is a prime.

It is a super-2 number, since 2×2581398625² = 13327237722303781250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5575144 + ... + 5575606.

It is an arithmetic number, because the mean of its divisors is an integer number (56242368).

Almost surely, 2^2581398625 is an apocalyptic number.

2581398625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2581398625 is a deficient number, since it is larger than the sum of its proper divisors (1018112927).

2581398625 is a wasteful number, since it uses less digits than its factorization.

2581398625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 601 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 49.

The square root of 2581398625 is about 50807.4662328284. The cubic root of 2581398625 is about 1371.7817627320.

The spelling of 2581398625 in words is "two billion, five hundred eighty-one million, three hundred ninety-eight thousand, six hundred twenty-five".