26845687391 has 4 divisors (see below), whose sum is σ = 26947762512. Its totient is φ = 26743612272.

The previous prime is 26845687357. The next prime is 26845687441. The reversal of 26845687391 is 19378654862.

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 26845687391 - 2¹⁸ = 26845425247 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 26845687391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26845687321) 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, 51037166 + ... + 51037691.

It is an arithmetic number, because the mean of its divisors is an integer number (6736940628).

Almost surely, 2^26845687391 is an apocalyptic number.

26845687391 is a deficient number, since it is larger than the sum of its proper divisors (102075121).

26845687391 is a wasteful number, since it uses less digits than its factorization.

26845687391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102075120.

The product of its digits is 17418240, while the sum is 59.

The spelling of 26845687391 in words is "twenty-six billion, eight hundred forty-five million, six hundred eighty-seven thousand, three hundred ninety-one".