25716971857 has 8 divisors (see below), whose sum is σ = 26607867840. Its totient is φ = 24826349520.

The previous prime is 25716971801. The next prime is 25716971873. The reversal of 25716971857 is 75817961752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25716971857 - 2⁷ = 25716971729 is a prime.

It is a super-3 number, since 3×25716971857³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25717971857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132882 + ... + 262852.

It is an arithmetic number, because the mean of its divisors is an integer number (3325983480).

Almost surely, 2^25716971857 is an apocalyptic number.

It is an amenable number.

25716971857 is a deficient number, since it is larger than the sum of its proper divisors (890895983).

25716971857 is a wasteful number, since it uses less digits than its factorization.

25716971857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136823.

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

The spelling of 25716971857 in words is "twenty-five billion, seven hundred sixteen million, nine hundred seventy-one thousand, eight hundred fifty-seven".