25611346817 has 4 divisors (see below), whose sum is σ = 29270110656. Its totient is φ = 21952582980.

The previous prime is 25611346807. The next prime is 25611346829. The reversal of 25611346817 is 71864311652.

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 25611346817 - 2²⁸ = 25342911361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25611346807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1829381909 + ... + 1829381922.

It is an arithmetic number, because the mean of its divisors is an integer number (7317527664).

Almost surely, 2^25611346817 is an apocalyptic number.

It is an amenable number.

25611346817 is a deficient number, since it is larger than the sum of its proper divisors (3658763839).

25611346817 is an equidigital number, since it uses as much as digits as its factorization.

25611346817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658763838.

The product of its digits is 241920, while the sum is 44.

The spelling of 25611346817 in words is "twenty-five billion, six hundred eleven million, three hundred forty-six thousand, eight hundred seventeen".