26332778081 has 2 divisors, whose sum is σ = 26332778082. Its totient is φ = 26332778080.

The previous prime is 26332778047. The next prime is 26332778111. The reversal of 26332778081 is 18087723362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13820118481 + 12512659600 = 117559^2 + 111860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26332778081 is a prime.

It is a super-2 number, since 2×26332778081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26332778581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13166389040 + 13166389041.

It is an arithmetic number, because the mean of its divisors is an integer number (13166389041).

Almost surely, 2^26332778081 is an apocalyptic number.

It is an amenable number.

26332778081 is a deficient number, since it is larger than the sum of its proper divisors (1).

26332778081 is an equidigital number, since it uses as much as digits as its factorization.

26332778081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 26332778081 in words is "twenty-six billion, three hundred thirty-two million, seven hundred seventy-eight thousand, eighty-one".