25840002861 has 20 divisors (see below), whose sum is σ = 38628616444. Its totient is φ = 17214120000.

The previous prime is 25840002847. The next prime is 25840002899. The reversal of 25840002861 is 16820004852.

It can be written as a sum of positive squares in 2 ways, for example, as 4210712100 + 21629290761 = 64890^2 + 147069^2 .

It is not a de Polignac number, because 25840002861 - 2⁵ = 25840002829 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 (25840002821) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3640 + ... + 227361.

Almost surely, 2^25840002861 is an apocalyptic number.

It is an amenable number.

25840002861 is a deficient number, since it is larger than the sum of its proper divisors (12788613583).

25840002861 is a wasteful number, since it uses less digits than its factorization.

25840002861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232394 (or 232385 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The spelling of 25840002861 in words is "twenty-five billion, eight hundred forty million, two thousand, eight hundred sixty-one".