26765845991 has 4 divisors (see below), whose sum is σ = 27489247272. Its totient is φ = 26042444712.

The previous prime is 26765845969. The next prime is 26765846057. The reversal of 26765845991 is 19954856762.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26765845991 is a prime.

It is a super-2 number, since 2×26765845991² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26765845961) 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, 361700585 + ... + 361700658.

It is an arithmetic number, because the mean of its divisors is an integer number (6872311818).

Almost surely, 2^26765845991 is an apocalyptic number.

26765845991 is a deficient number, since it is larger than the sum of its proper divisors (723401281).

26765845991 is an equidigital number, since it uses as much as digits as its factorization.

26765845991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723401280.

The product of its digits is 32659200, while the sum is 62.

The spelling of 26765845991 in words is "twenty-six billion, seven hundred sixty-five million, eight hundred forty-five thousand, nine hundred ninety-one".