25851489556 has 6 divisors (see below), whose sum is σ = 45240106730. Its totient is φ = 12925744776.

The previous prime is 25851489553. The next prime is 25851489557. The reversal of 25851489556 is 65598415852.

It can be written as a sum of positive squares in only one way, i.e., 25690960656 + 160528900 = 160284^2 + 12670^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25851489556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25851489551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3231436191 + ... + 3231436198.

Almost surely, 2^25851489556 is an apocalyptic number.

It is an amenable number.

25851489556 is a deficient number, since it is larger than the sum of its proper divisors (19388617174).

25851489556 is a wasteful number, since it uses less digits than its factorization.

25851489556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462872393 (or 6462872391 counting only the distinct ones).

The product of its digits is 17280000, while the sum is 58.

The spelling of 25851489556 in words is "twenty-five billion, eight hundred fifty-one million, four hundred eighty-nine thousand, five hundred fifty-six".