25185044261 has 16 divisors (see below), whose sum is σ = 27539265600. Its totient is φ = 22890688128.

The previous prime is 25185044249. The next prime is 25185044267. The reversal of 25185044261 is 16244058152.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25185044261 - 2²⁶ = 25117935397 is a prime.

It is a super-2 number, since 2×25185044261² (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 (25185044267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2581130 + ... + 2590868.

It is an arithmetic number, because the mean of its divisors is an integer number (1721204100).

Almost surely, 2^25185044261 is an apocalyptic number.

It is an amenable number.

25185044261 is a deficient number, since it is larger than the sum of its proper divisors (2354221339).

25185044261 is a wasteful number, since it uses less digits than its factorization.

25185044261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12788.

The product of its (nonzero) digits is 76800, while the sum is 38.

The spelling of 25185044261 in words is "twenty-five billion, one hundred eighty-five million, forty-four thousand, two hundred sixty-one".