25189779285 has 96 divisors (see below), whose sum is σ = 50445877248. Its totient is φ = 11507506560.

The previous prime is 25189779271. The next prime is 25189779323. The reversal of 25189779285 is 58297798152.

25189779285 is a `hidden beast` number, since 2 + 518 + 97 + 7 + 9 + 28 + 5 = 666.

It is not a de Polignac number, because 25189779285 - 2⁴ = 25189779269 is a prime.

It is a super-2 number, since 2×25189779285² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 746284 + ... + 779306.

It is an arithmetic number, because the mean of its divisors is an integer number (525477888).

Almost surely, 2^25189779285 is an apocalyptic number.

It is an amenable number.

25189779285 is an abundant number, since it is smaller than the sum of its proper divisors (25256097963).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25189779285 is a wasteful number, since it uses less digits than its factorization.

25189779285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33135 (or 33132 counting only the distinct ones).

The product of its digits is 25401600, while the sum is 63.

The spelling of 25189779285 in words is "twenty-five billion, one hundred eighty-nine million, seven hundred seventy-nine thousand, two hundred eighty-five".