26910800197 has 2 divisors, whose sum is σ = 26910800198. Its totient is φ = 26910800196.

The previous prime is 26910800179. The next prime is 26910800201. The reversal of 26910800197 is 79100801962.

Together with previous prime (26910800179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26226506916 + 684293281 = 161946^2 + 26159^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26910800197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26910800597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13455400098 + 13455400099.

It is an arithmetic number, because the mean of its divisors is an integer number (13455400099).

Almost surely, 2^26910800197 is an apocalyptic number.

It is an amenable number.

26910800197 is a deficient number, since it is larger than the sum of its proper divisors (1).

26910800197 is an equidigital number, since it uses as much as digits as its factorization.

26910800197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 43.

The spelling of 26910800197 in words is "twenty-six billion, nine hundred ten million, eight hundred thousand, one hundred ninety-seven".