26005968891 has 48 divisors (see below), whose sum is σ = 44840304000. Its totient is φ = 14853008016.

The previous prime is 26005968887. The next prime is 26005968991. The reversal of 26005968891 is 19886950062.

It is a happy number.

It is not a de Polignac number, because 26005968891 - 2² = 26005968887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26005968811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3567136 + ... + 3574418.

It is an arithmetic number, because the mean of its divisors is an integer number (934173000).

Almost surely, 2^26005968891 is an apocalyptic number.

26005968891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

26005968891 is a deficient number, since it is larger than the sum of its proper divisors (18834335109).

26005968891 is a wasteful number, since it uses less digits than its factorization.

26005968891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10005 (or 9992 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 26005968891 in words is "twenty-six billion, five million, nine hundred sixty-eight thousand, eight hundred ninety-one".