25353886561 has 4 divisors (see below), whose sum is σ = 25435410624. Its totient is φ = 25272362500.

The previous prime is 25353886541. The next prime is 25353886573. The reversal of 25353886561 is 16568835352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25353886561 - 2⁵ = 25353886529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25353886499 and 25353886508.

It is not an unprimeable number, because it can be changed into a prime (25353886541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40761565 + ... + 40762186.

It is an arithmetic number, because the mean of its divisors is an integer number (6358852656).

Almost surely, 2^25353886561 is an apocalyptic number.

It is an amenable number.

25353886561 is a deficient number, since it is larger than the sum of its proper divisors (81524063).

25353886561 is an equidigital number, since it uses as much as digits as its factorization.

25353886561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81524062.

The product of its digits is 5184000, while the sum is 52.

The spelling of 25353886561 in words is "twenty-five billion, three hundred fifty-three million, eight hundred eighty-six thousand, five hundred sixty-one".