25604840651 has 4 divisors (see below), whose sum is σ = 27574443792. Its totient is φ = 23635237512.

The previous prime is 25604840647. The next prime is 25604840663. The reversal of 25604840651 is 15604840652.

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

It is a cyclic number.

It is not a de Polignac number, because 25604840651 - 2² = 25604840647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25604840599 and 25604840608.

It is not an unprimeable number, because it can be changed into a prime (25604840351) 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, 984801551 + ... + 984801576.

It is an arithmetic number, because the mean of its divisors is an integer number (6893610948).

Almost surely, 2^25604840651 is an apocalyptic number.

25604840651 is a deficient number, since it is larger than the sum of its proper divisors (1969603141).

25604840651 is a wasteful number, since it uses less digits than its factorization.

25604840651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1969603140.

The product of its (nonzero) digits is 230400, while the sum is 41.

Subtracting from 25604840651 its reverse (15604840652), we obtain a palindrome (9999999999).

The spelling of 25604840651 in words is "twenty-five billion, six hundred four million, eight hundred forty thousand, six hundred fifty-one".