26231981913 has 48 divisors (see below), whose sum is σ = 40856038080. Its totient is φ = 16164997632.

The previous prime is 26231981861. The next prime is 26231981921. The reversal of 26231981913 is 31918913262.

It is a happy number.

26231981913 is a `hidden beast` number, since 2 + 623 + 1 + 9 + 8 + 1 + 9 + 13 = 666.

It is not a de Polignac number, because 26231981913 - 2²² = 26227787609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26231981983) 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 47 ways as a sum of consecutive naturals, for example, 12182845 + ... + 12184997.

It is an arithmetic number, because the mean of its divisors is an integer number (851167460).

Almost surely, 2^26231981913 is an apocalyptic number.

It is an amenable number.

26231981913 is a deficient number, since it is larger than the sum of its proper divisors (14624056167).

26231981913 is a wasteful number, since it uses less digits than its factorization.

26231981913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3878 (or 3875 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The spelling of 26231981913 in words is "twenty-six billion, two hundred thirty-one million, nine hundred eighty-one thousand, nine hundred thirteen".