25664521343 has 4 divisors (see below), whose sum is σ = 25665862248. Its totient is φ = 25663180440.

The previous prime is 25664521331. The next prime is 25664521357. The reversal of 25664521343 is 34312546652.

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 25664521343 - 2⁴ = 25664521327 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 25664521343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25661521343) 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, 641321 + ... + 680162.

It is an arithmetic number, because the mean of its divisors is an integer number (6416465562).

Almost surely, 2^25664521343 is an apocalyptic number.

25664521343 is a deficient number, since it is larger than the sum of its proper divisors (1340905).

25664521343 is a wasteful number, since it uses less digits than its factorization.

25664521343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340904.

The product of its digits is 518400, while the sum is 41.

The spelling of 25664521343 in words is "twenty-five billion, six hundred sixty-four million, five hundred twenty-one thousand, three hundred forty-three".