25128871705 has 16 divisors (see below), whose sum is σ = 36276266880. Its totient is φ = 16324319232.

The previous prime is 25128871681. The next prime is 25128871711. The reversal of 25128871705 is 50717882152.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25128871705 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18893224 + ... + 18894553.

It is an arithmetic number, because the mean of its divisors is an integer number (2267266680).

Almost surely, 2^25128871705 is an apocalyptic number.

It is an amenable number.

25128871705 is a deficient number, since it is larger than the sum of its proper divisors (11147395175).

25128871705 is a wasteful number, since it uses less digits than its factorization.

25128871705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37787808.

The product of its (nonzero) digits is 313600, while the sum is 46.

The spelling of 25128871705 in words is "twenty-five billion, one hundred twenty-eight million, eight hundred seventy-one thousand, seven hundred five".