25240406243 has 16 divisors (see below), whose sum is σ = 29709340416. Its totient is φ = 21220945920.

The previous prime is 25240406221. The next prime is 25240406263. The reversal of 25240406243 is 34260404252.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25240406243 - 2²⁰ = 25239357667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25240406203) 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, 1835246 + ... + 1848947.

It is an arithmetic number, because the mean of its divisors is an integer number (1856833776).

Almost surely, 2^25240406243 is an apocalyptic number.

25240406243 is a deficient number, since it is larger than the sum of its proper divisors (4468934173).

25240406243 is a wasteful number, since it uses less digits than its factorization.

25240406243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684254.

The product of its (nonzero) digits is 46080, while the sum is 32.

The spelling of 25240406243 in words is "twenty-five billion, two hundred forty million, four hundred six thousand, two hundred forty-three".