26566320679991 has 2 divisors, whose sum is σ = 26566320679992. Its totient is φ = 26566320679990.

The previous prime is 26566320679967. The next prime is 26566320680071. The reversal of 26566320679991 is 19997602366562.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26566320679991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26566320279991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13283160339995 + 13283160339996.

It is an arithmetic number, because the mean of its divisors is an integer number (13283160339996).

Almost surely, 2^{26566320679991} is an apocalyptic number.

26566320679991 is a deficient number, since it is larger than the sum of its proper divisors (1).

26566320679991 is an equidigital number, since it uses as much as digits as its factorization.

26566320679991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396809280, while the sum is 71.

The spelling of 26566320679991 in words is "twenty-six trillion, five hundred sixty-six billion, three hundred twenty million, six hundred seventy-nine thousand, nine hundred ninety-one".