25085105008581 has 4 divisors (see below), whose sum is σ = 33446806678112. Its totient is φ = 16723403339052.

The previous prime is 25085105008571. The next prime is 25085105008603. The reversal of 25085105008581 is 18580050158052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25085105008581 - 2⁵ = 25085105008549 is a prime.

It is a super-2 number, since 2×25085105008581² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25085105008581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25085105008571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4180850834761 + ... + 4180850834766.

It is an arithmetic number, because the mean of its divisors is an integer number (8361701669528).

Almost surely, 2^{25085105008581} is an apocalyptic number.

It is an amenable number.

25085105008581 is a deficient number, since it is larger than the sum of its proper divisors (8361701669531).

25085105008581 is an equidigital number, since it uses as much as digits as its factorization.

25085105008581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8361701669530.

The product of its (nonzero) digits is 640000, while the sum is 48.

The spelling of 25085105008581 in words is "twenty-five trillion, eighty-five billion, one hundred five million, eight thousand, five hundred eighty-one".