26211290491 has 4 divisors (see below), whose sum is σ = 26211693712. Its totient is φ = 26210887272.

The previous prime is 26211290411. The next prime is 26211290513. The reversal of 26211290491 is 19409211262.

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 26211290491 - 2¹³ = 26211282299 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 26211290491.

It is not an unprimeable number, because it can be changed into a prime (26211290411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79416 + ... + 242341.

It is an arithmetic number, because the mean of its divisors is an integer number (6552923428).

Almost surely, 2^26211290491 is an apocalyptic number.

26211290491 is a deficient number, since it is larger than the sum of its proper divisors (403221).

26211290491 is an equidigital number, since it uses as much as digits as its factorization.

26211290491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403220.

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 26211290491 in words is "twenty-six billion, two hundred eleven million, two hundred ninety thousand, four hundred ninety-one".