25849886842 has 32 divisors (see below), whose sum is σ = 42600578832. Its totient is φ = 11690425344.

The previous prime is 25849886833. The next prime is 25849886849. The reversal of 25849886842 is 24868894852.

It is a Cunningham number, because it is equal to 160779²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 8447264281 + 17402622561 = 91909^2 + 131919^2 .

It is not an unprimeable number, because it can be changed into a prime (25849886849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1086498 + ... + 1110034.

Almost surely, 2^25849886842 is an apocalyptic number.

25849886842 is a deficient number, since it is larger than the sum of its proper divisors (16750691990).

25849886842 is a wasteful number, since it uses less digits than its factorization.

25849886842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24402.

The product of its digits is 70778880, while the sum is 64.

The spelling of 25849886842 in words is "twenty-five billion, eight hundred forty-nine million, eight hundred eighty-six thousand, eight hundred forty-two".