25857791617 has 12 divisors (see below), whose sum is σ = 30088287216. Its totient is φ = 22157325960.

The previous prime is 25857791611. The next prime is 25857791627. The reversal of 25857791617 is 71619775852.

It is not a de Polignac number, because 25857791617 - 2³¹ = 23710307969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25857791611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95478 + ... + 246640.

It is an arithmetic number, because the mean of its divisors is an integer number (2507357268).

Almost surely, 2^25857791617 is an apocalyptic number.

It is an amenable number.

25857791617 is a deficient number, since it is larger than the sum of its proper divisors (4230495599).

25857791617 is a wasteful number, since it uses less digits than its factorization.

25857791617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154668 (or 154661 counting only the distinct ones).

The product of its digits is 7408800, while the sum is 58.

The spelling of 25857791617 in words is "twenty-five billion, eight hundred fifty-seven million, seven hundred ninety-one thousand, six hundred seventeen".