25165066225 has 48 divisors (see below), whose sum is σ = 34568881200. Its totient is φ = 18052070400.

The previous prime is 25165066183. The next prime is 25165066231. The reversal of 25165066225 is 52266056152.

It can be written as a sum of positive squares in 24 ways, for example, as 11924421601 + 13240644624 = 109199^2 + 115068^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25165066225 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9871251 + ... + 9873799.

It is an arithmetic number, because the mean of its divisors is an integer number (720185025).

Almost surely, 2^25165066225 is an apocalyptic number.

25165066225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25165066225 is a deficient number, since it is larger than the sum of its proper divisors (9403814975).

25165066225 is a wasteful number, since it uses less digits than its factorization.

25165066225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430 (or 3425 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 25165066225 in words is "twenty-five billion, one hundred sixty-five million, sixty-six thousand, two hundred twenty-five".