25179284861 has 16 divisors (see below), whose sum is σ = 26799600000. Its totient is φ = 23589890496.

The previous prime is 25179284849. The next prime is 25179284917. The reversal of 25179284861 is 16848297152.

It is not a de Polignac number, because 25179284861 - 2⁶ = 25179284797 is a prime.

It is a super-2 number, since 2×25179284861² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25179284161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 628880 + ... + 667718.

It is an arithmetic number, because the mean of its divisors is an integer number (1674975000).

Almost surely, 2^25179284861 is an apocalyptic number.

It is an amenable number.

25179284861 is a deficient number, since it is larger than the sum of its proper divisors (1620315139).

25179284861 is a wasteful number, since it uses less digits than its factorization.

25179284861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39236.

The product of its digits is 1935360, while the sum is 53.

The spelling of 25179284861 in words is "twenty-five billion, one hundred seventy-nine million, two hundred eighty-four thousand, eight hundred sixty-one".