25085855581 has 8 divisors (see below), whose sum is σ = 25240944960. Its totient is φ = 24931212288.

The previous prime is 25085855573. The next prime is 25085855647. The reversal of 25085855581 is 18555858052.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25085855581 - 2³ = 25085855573 is a prime.

It is a super-2 number, since 2×25085855581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25085855551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1650 + ... + 223996.

It is an arithmetic number, because the mean of its divisors is an integer number (3155118120).

Almost surely, 2^25085855581 is an apocalyptic number.

It is an amenable number.

25085855581 is a deficient number, since it is larger than the sum of its proper divisors (155089379).

25085855581 is a wasteful number, since it uses less digits than its factorization.

25085855581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223043.

The product of its (nonzero) digits is 3200000, while the sum is 52.

The spelling of 25085855581 in words is "twenty-five billion, eighty-five million, eight hundred fifty-five thousand, five hundred eighty-one".