25565409055 has 16 divisors (see below), whose sum is σ = 32321887200. Its totient is φ = 19358645760.

The previous prime is 25565409053. The next prime is 25565409139. The reversal of 25565409055 is 55090456552.

It is a happy number.

It is not a de Polignac number, because 25565409055 - 2¹ = 25565409053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25565408996 and 25565409014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25565409053) 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, 11926 + ... + 226435.

It is an arithmetic number, because the mean of its divisors is an integer number (2020117950).

Almost surely, 2^25565409055 is an apocalyptic number.

25565409055 is a deficient number, since it is larger than the sum of its proper divisors (6756478145).

25565409055 is a wasteful number, since it uses less digits than its factorization.

25565409055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239514.

The product of its (nonzero) digits is 1350000, while the sum is 46.

The spelling of 25565409055 in words is "twenty-five billion, five hundred sixty-five million, four hundred nine thousand, fifty-five".