25850061081 has 12 divisors (see below), whose sum is σ = 40211206308. Its totient is φ = 15907729824.

The previous prime is 25850061079. The next prime is 25850061091. The reversal of 25850061081 is 18016005852.

It can be written as a sum of positive squares in 2 ways, for example, as 3079251081 + 22770810000 = 55491^2 + 150900^2 .

It is not a de Polignac number, because 25850061081 - 2¹ = 25850061079 is a prime.

It is a super-2 number, since 2×25850061081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25850061001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110470230 + ... + 110470463.

It is an arithmetic number, because the mean of its divisors is an integer number (3350933859).

Almost surely, 2^25850061081 is an apocalyptic number.

It is an amenable number.

25850061081 is a deficient number, since it is larger than the sum of its proper divisors (14361145227).

25850061081 is a wasteful number, since it uses less digits than its factorization.

25850061081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220940712 (or 220940709 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The spelling of 25850061081 in words is "twenty-five billion, eight hundred fifty million, sixty-one thousand, eighty-one".