25681522633 has 4 divisors (see below), whose sum is σ = 27657024388. Its totient is φ = 23706020880.

The previous prime is 25681522627. The next prime is 25681522649. The reversal of 25681522633 is 33622518652.

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 8985523264 + 16695999369 = 94792^2 + 129213^2 .

It is a cyclic number.

It is not a de Polignac number, because 25681522633 - 2²¹ = 25679425481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25681522633.

It is not an unprimeable number, because it can be changed into a prime (25681529633) 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, 987750858 + ... + 987750883.

It is an arithmetic number, because the mean of its divisors is an integer number (6914256097).

Almost surely, 2^25681522633 is an apocalyptic number.

It is an amenable number.

25681522633 is a deficient number, since it is larger than the sum of its proper divisors (1975501755).

25681522633 is a wasteful number, since it uses less digits than its factorization.

25681522633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975501754.

The product of its digits is 518400, while the sum is 43.

The spelling of 25681522633 in words is "twenty-five billion, six hundred eighty-one million, five hundred twenty-two thousand, six hundred thirty-three".