25916338817 has 4 divisors (see below), whose sum is σ = 25917888960. Its totient is φ = 25914788676.

The previous prime is 25916338813. The next prime is 25916338849. The reversal of 25916338817 is 71883361952.

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 25916338817 - 2² = 25916338813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25916338813) 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, 749717 + ... + 783522.

It is an arithmetic number, because the mean of its divisors is an integer number (6479472240).

Almost surely, 2^25916338817 is an apocalyptic number.

It is an amenable number.

25916338817 is a deficient number, since it is larger than the sum of its proper divisors (1550143).

25916338817 is a wasteful number, since it uses less digits than its factorization.

25916338817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550142.

The product of its digits is 2177280, while the sum is 53.

The spelling of 25916338817 in words is "twenty-five billion, nine hundred sixteen million, three hundred thirty-eight thousand, eight hundred seventeen".