25820055543 has 16 divisors (see below), whose sum is σ = 35841549536. Its totient is φ = 16518712320.

The previous prime is 25820055517. The next prime is 25820055563. The reversal of 25820055543 is 34555002852.

It is not a de Polignac number, because 25820055543 - 2⁵ = 25820055511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25820055563) 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, 1585138 + ... + 1601343.

It is an arithmetic number, because the mean of its divisors is an integer number (2240096846).

Almost surely, 2^25820055543 is an apocalyptic number.

25820055543 is a deficient number, since it is larger than the sum of its proper divisors (10021493993).

25820055543 is a wasteful number, since it uses less digits than its factorization.

25820055543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3186594.

The product of its (nonzero) digits is 240000, while the sum is 39.

The spelling of 25820055543 in words is "twenty-five billion, eight hundred twenty million, fifty-five thousand, five hundred forty-three".