25165341561 has 4 divisors (see below), whose sum is σ = 33553788752. Its totient is φ = 16776894372.

The previous prime is 25165341557. The next prime is 25165341577. The reversal of 25165341561 is 16514356152.

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 not a de Polignac number, because 25165341561 - 2² = 25165341557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25165341581) 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, 4194223591 + ... + 4194223596.

It is an arithmetic number, because the mean of its divisors is an integer number (8388447188).

Almost surely, 2^25165341561 is an apocalyptic number.

It is an amenable number.

25165341561 is a deficient number, since it is larger than the sum of its proper divisors (8388447191).

25165341561 is an equidigital number, since it uses as much as digits as its factorization.

25165341561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8388447190.

The product of its digits is 108000, while the sum is 39.

The spelling of 25165341561 in words is "twenty-five billion, one hundred sixty-five million, three hundred forty-one thousand, five hundred sixty-one".