25363650161 has 4 divisors (see below), whose sum is σ = 25842209652. Its totient is φ = 24885090672.

The previous prime is 25363650119. The next prime is 25363650163. The reversal of 25363650161 is 16105636352.

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 10612090225 + 14751559936 = 103015^2 + 121456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25363650161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25363650163) 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, 239279666 + ... + 239279771.

It is an arithmetic number, because the mean of its divisors is an integer number (6460552413).

Almost surely, 2^25363650161 is an apocalyptic number.

It is an amenable number.

25363650161 is a deficient number, since it is larger than the sum of its proper divisors (478559491).

25363650161 is an equidigital number, since it uses as much as digits as its factorization.

25363650161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478559490.

The product of its (nonzero) digits is 97200, while the sum is 38.

The spelling of 25363650161 in words is "twenty-five billion, three hundred sixty-three million, six hundred fifty thousand, one hundred sixty-one".