26797865663 has 4 divisors (see below), whose sum is σ = 28374210720. Its totient is φ = 25221520608.

The previous prime is 26797865621. The next prime is 26797865681. The reversal of 26797865663 is 36656879762.

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 26797865663 - 2⁸ = 26797865407 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 26797865663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26797865693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788172503 + ... + 788172536.

It is an arithmetic number, because the mean of its divisors is an integer number (7093552680).

Almost surely, 2^26797865663 is an apocalyptic number.

26797865663 is a deficient number, since it is larger than the sum of its proper divisors (1576345057).

26797865663 is a wasteful number, since it uses less digits than its factorization.

26797865663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576345056.

The product of its digits is 137168640, while the sum is 65.

The spelling of 26797865663 in words is "twenty-six billion, seven hundred ninety-seven million, eight hundred sixty-five thousand, six hundred sixty-three".