25998732543 has 16 divisors (see below), whose sum is σ = 39846122496. Its totient is φ = 14770541280.

The previous prime is 25998732491. The next prime is 25998732559. The reversal of 25998732543 is 34523789952.

It is a happy number.

It is not a de Polignac number, because 25998732543 - 2³⁴ = 8818863359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25998732443) 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, 3574503 + ... + 3581768.

It is an arithmetic number, because the mean of its divisors is an integer number (2490382656).

Almost surely, 2^25998732543 is an apocalyptic number.

25998732543 is a deficient number, since it is larger than the sum of its proper divisors (13847389953).

25998732543 is a wasteful number, since it uses less digits than its factorization.

25998732543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7156454.

The product of its digits is 16329600, while the sum is 57.

The spelling of 25998732543 in words is "twenty-five billion, nine hundred ninety-eight million, seven hundred thirty-two thousand, five hundred forty-three".