25805081943 has 6 divisors (see below), whose sum is σ = 37274007264. Its totient is φ = 17203387956.

The previous prime is 25805081927. The next prime is 25805081993. The reversal of 25805081943 is 34918050852.

25805081943 is a `hidden beast` number, since 2 + 58 + 0 + 508 + 1 + 94 + 3 = 666.

It is not a de Polignac number, because 25805081943 - 2⁴ = 25805081927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25805081923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1433615655 + ... + 1433615672.

It is an arithmetic number, because the mean of its divisors is an integer number (6212334544).

Almost surely, 2^25805081943 is an apocalyptic number.

25805081943 is a deficient number, since it is larger than the sum of its proper divisors (11468925321).

25805081943 is a wasteful number, since it uses less digits than its factorization.

25805081943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2867231333 (or 2867231330 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 25805081943 in words is "twenty-five billion, eight hundred five million, eighty-one thousand, nine hundred forty-three".