26979748897 has 2 divisors, whose sum is σ = 26979748898. Its totient is φ = 26979748896.

The previous prime is 26979748841. The next prime is 26979748919. The reversal of 26979748897 is 79884797962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15284624161 + 11695124736 = 123631^2 + 108144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26979748897 is a prime.

It is not a weakly prime, because it can be changed into another prime (26979748597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13489874448 + 13489874449.

It is an arithmetic number, because the mean of its divisors is an integer number (13489874449).

Almost surely, 2^26979748897 is an apocalyptic number.

It is an amenable number.

26979748897 is a deficient number, since it is larger than the sum of its proper divisors (1).

26979748897 is an equidigital number, since it uses as much as digits as its factorization.

26979748897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768144384, while the sum is 76.

The spelling of 26979748897 in words is "twenty-six billion, nine hundred seventy-nine million, seven hundred forty-eight thousand, eight hundred ninety-seven".