25616861653 has 8 divisors (see below), whose sum is σ = 26518867200. Its totient is φ = 24716100528.

The previous prime is 25616861617. The next prime is 25616861657. The reversal of 25616861653 is 35616861652.

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

It is a cyclic number.

It is not a de Polignac number, because 25616861653 - 2⁹ = 25616861141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25616861597 and 25616861606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25616861657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269113 + ... + 351646.

It is an arithmetic number, because the mean of its divisors is an integer number (3314858400).

Almost surely, 2^25616861653 is an apocalyptic number.

It is an amenable number.

25616861653 is a deficient number, since it is larger than the sum of its proper divisors (902005547).

25616861653 is a wasteful number, since it uses less digits than its factorization.

25616861653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622211.

The product of its digits is 1555200, while the sum is 49.

Subtracting 25616861653 from its reverse (35616861652), we obtain a palindrome (9999999999).

The spelling of 25616861653 in words is "twenty-five billion, six hundred sixteen million, eight hundred sixty-one thousand, six hundred fifty-three".