26909011691 has 2 divisors, whose sum is σ = 26909011692. Its totient is φ = 26909011690.

The previous prime is 26909011639. The next prime is 26909011709. The reversal of 26909011691 is 19611090962.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26909011691 is a prime.

It is not a weakly prime, because it can be changed into another prime (26909011601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13454505845 + 13454505846.

It is an arithmetic number, because the mean of its divisors is an integer number (13454505846).

Almost surely, 2^26909011691 is an apocalyptic number.

26909011691 is a deficient number, since it is larger than the sum of its proper divisors (1).

26909011691 is an equidigital number, since it uses as much as digits as its factorization.

26909011691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 44.

The spelling of 26909011691 in words is "twenty-six billion, nine hundred nine million, eleven thousand, six hundred ninety-one".