26491340993 has 48 divisors (see below), whose sum is σ = 30725553600. Its totient is φ = 22785235200.

The previous prime is 26491340977. The next prime is 26491340999. The reversal of 26491340993 is 39904319462.

It is not a de Polignac number, because 26491340993 - 2⁴ = 26491340977 is a prime.

It is a super-2 number, since 2×26491340993² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26491340999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25205318 + ... + 25206368.

It is an arithmetic number, because the mean of its divisors is an integer number (640115700).

Almost surely, 2^26491340993 is an apocalyptic number.

It is an amenable number.

26491340993 is a deficient number, since it is larger than the sum of its proper divisors (4234212607).

26491340993 is a wasteful number, since it uses less digits than its factorization.

26491340993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282 (or 1269 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 50.

The spelling of 26491340993 in words is "twenty-six billion, four hundred ninety-one million, three hundred forty thousand, nine hundred ninety-three".