26921679797 has 2 divisors, whose sum is σ = 26921679798. Its totient is φ = 26921679796.

The previous prime is 26921679769. The next prime is 26921679809. The reversal of 26921679797 is 79797612962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14590465681 + 12331214116 = 120791^2 + 111046^2 .

It is a cyclic number.

It is not a de Polignac number, because 26921679797 - 2¹⁶ = 26921614261 is a prime.

It is a super-2 number, since 2×26921679797² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26921679727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13460839898 + 13460839899.

It is an arithmetic number, because the mean of its divisors is an integer number (13460839899).

Almost surely, 2^26921679797 is an apocalyptic number.

It is an amenable number.

26921679797 is a deficient number, since it is larger than the sum of its proper divisors (1).

26921679797 is an equidigital number, since it uses as much as digits as its factorization.

26921679797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36006768, while the sum is 65.

The spelling of 26921679797 in words is "twenty-six billion, nine hundred twenty-one million, six hundred seventy-nine thousand, seven hundred ninety-seven".