26798899997 has 2 divisors, whose sum is σ = 26798899998. Its totient is φ = 26798899996.

The previous prime is 26798899957. The next prime is 26798900003. The reversal of 26798899997 is 79999889762.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14320669561 + 12478230436 = 119669^2 + 111706^2 .

It is a cyclic number.

It is not a de Polignac number, because 26798899997 - 2¹⁴ = 26798883613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26798899957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13399449998 + 13399449999.

It is an arithmetic number, because the mean of its divisors is an integer number (13399449999).

Almost surely, 2^26798899997 is an apocalyptic number.

It is an amenable number.

26798899997 is a deficient number, since it is larger than the sum of its proper divisors (1).

26798899997 is an equidigital number, since it uses as much as digits as its factorization.

26798899997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2222131968, while the sum is 83.

The spelling of 26798899997 in words is "twenty-six billion, seven hundred ninety-eight million, eight hundred ninety-nine thousand, nine hundred ninety-seven".