25544445261 has 8 divisors (see below), whose sum is σ = 34276198944. Its totient is φ = 16921160880.

The previous prime is 25544445257. The next prime is 25544445299. The reversal of 25544445261 is 16254444552.

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

It is not a de Polignac number, because 25544445261 - 2² = 25544445257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25544445221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27116775 + ... + 27117716.

It is an arithmetic number, because the mean of its divisors is an integer number (4284524868).

Almost surely, 2^25544445261 is an apocalyptic number.

It is an amenable number.

25544445261 is a deficient number, since it is larger than the sum of its proper divisors (8731753683).

25544445261 is a wasteful number, since it uses less digits than its factorization.

25544445261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54234651.

The product of its digits is 768000, while the sum is 42.

The spelling of 25544445261 in words is "twenty-five billion, five hundred forty-four million, four hundred forty-five thousand, two hundred sixty-one".