26779267961 has 2 divisors, whose sum is σ = 26779267962. Its totient is φ = 26779267960.

The previous prime is 26779267937. The next prime is 26779267987. The reversal of 26779267961 is 16976297762.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26606503225 + 172764736 = 163115^2 + 13144^2 .

It is a cyclic number.

It is not a de Polignac number, because 26779267961 - 2⁶ = 26779267897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 26779267894 and 26779267903.

It is not a weakly prime, because it can be changed into another prime (26779267661) 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, 13389633980 + 13389633981.

It is an arithmetic number, because the mean of its divisors is an integer number (13389633981).

Almost surely, 2^26779267961 is an apocalyptic number.

It is an amenable number.

26779267961 is a deficient number, since it is larger than the sum of its proper divisors (1).

26779267961 is an equidigital number, since it uses as much as digits as its factorization.

26779267961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24004512, while the sum is 62.

The spelling of 26779267961 in words is "twenty-six billion, seven hundred seventy-nine million, two hundred sixty-seven thousand, nine hundred sixty-one".