25853858661 has 8 divisors (see below), whose sum is σ = 35273481760. Its totient is φ = 16835070672.

The previous prime is 25853858647. The next prime is 25853858677. The reversal of 25853858661 is 16685835852.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25853858661 - 2⁷ = 25853858533 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 (25853858861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100208626 + ... + 100208883.

It is an arithmetic number, because the mean of its divisors is an integer number (4409185220).

Almost surely, 2^25853858661 is an apocalyptic number.

It is an amenable number.

25853858661 is a deficient number, since it is larger than the sum of its proper divisors (9419623099).

25853858661 is a wasteful number, since it uses less digits than its factorization.

25853858661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200417555.

The product of its digits is 13824000, while the sum is 57.

The spelling of 25853858661 in words is "twenty-five billion, eight hundred fifty-three million, eight hundred fifty-eight thousand, six hundred sixty-one".