25803514861 has 4 divisors (see below), whose sum is σ = 26432868924. Its totient is φ = 25174160800.

The previous prime is 25803514819. The next prime is 25803514871. The reversal of 25803514861 is 16841530852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14159810025 + 11643704836 = 118995^2 + 107906^2 .

It is a cyclic number.

It is not a de Polignac number, because 25803514861 - 2¹³ = 25803506669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25803514801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314676970 + ... + 314677051.

It is an arithmetic number, because the mean of its divisors is an integer number (6608217231).

Almost surely, 2^25803514861 is an apocalyptic number.

It is an amenable number.

25803514861 is a deficient number, since it is larger than the sum of its proper divisors (629354063).

25803514861 is an equidigital number, since it uses as much as digits as its factorization.

25803514861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629354062.

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 25803514861 in words is "twenty-five billion, eight hundred three million, five hundred fourteen thousand, eight hundred sixty-one".