26563857265 has 16 divisors (see below), whose sum is σ = 34778577600. Its totient is φ = 19316905920.

The previous prime is 26563857217. The next prime is 26563857277. The reversal of 26563857265 is 56275836562.

It is a happy number.

26563857265 is a nontrivial binomial coefficient, being equal to C(230495, 2).

It is a de Polignac number, because none of the positive numbers 2^k-26563857265 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 553186 + ... + 599284.

It is an arithmetic number, because the mean of its divisors is an integer number (2173661100).

Almost surely, 2^26563857265 is an apocalyptic number.

26563857265 is the 230494-th triangular number.

26563857265 is the 76832-nd centered nonagonal number.

It is an amenable number.

26563857265 is a deficient number, since it is larger than the sum of its proper divisors (8214720335).

26563857265 is a wasteful number, since it uses less digits than its factorization.

26563857265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56592.

The product of its digits is 18144000, while the sum is 55.

The spelling of 26563857265 in words is "twenty-six billion, five hundred sixty-three million, eight hundred fifty-seven thousand, two hundred sixty-five".