25662212605 has 4 divisors (see below), whose sum is σ = 30794655132. Its totient is φ = 20529770080.

The previous prime is 25662212599. The next prime is 25662212617. The reversal of 25662212605 is 50621226652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5701609081 + 19960603524 = 75509^2 + 141282^2 .

It is not a de Polignac number, because 25662212605 - 2¹¹ = 25662210557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2566221256 + ... + 2566221265.

It is an arithmetic number, because the mean of its divisors is an integer number (7698663783).

Almost surely, 2^25662212605 is an apocalyptic number.

It is an amenable number.

25662212605 is a deficient number, since it is larger than the sum of its proper divisors (5132442527).

25662212605 is an equidigital number, since it uses as much as digits as its factorization.

25662212605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5132442526.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 25662212605 in words is "twenty-five billion, six hundred sixty-two million, two hundred twelve thousand, six hundred five".