25023162561 has 4 divisors (see below), whose sum is σ = 33364216752. Its totient is φ = 16682108372.

The previous prime is 25023162553. The next prime is 25023162569. The reversal of 25023162561 is 16526132052.

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 an interprime number because it is at equal distance from previous prime (25023162553) and next prime (25023162569).

It is a cyclic number.

It is not a de Polignac number, because 25023162561 - 2³ = 25023162553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25023162569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4170527091 + ... + 4170527096.

It is an arithmetic number, because the mean of its divisors is an integer number (8341054188).

Almost surely, 2^25023162561 is an apocalyptic number.

It is an amenable number.

25023162561 is a deficient number, since it is larger than the sum of its proper divisors (8341054191).

25023162561 is an equidigital number, since it uses as much as digits as its factorization.

25023162561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8341054190.

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 25023162561 in words is "twenty-five billion, twenty-three million, one hundred sixty-two thousand, five hundred sixty-one".