26398977281 has 2 divisors, whose sum is σ = 26398977282. Its totient is φ = 26398977280.

The previous prime is 26398977277. The next prime is 26398977299. The reversal of 26398977281 is 18277989362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26231041600 + 167935681 = 161960^2 + 12959^2 .

It is a cyclic number.

It is not a de Polignac number, because 26398977281 - 2² = 26398977277 is a prime.

It is a super-2 number, since 2×26398977281² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (26398977481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13199488640 + 13199488641.

It is an arithmetic number, because the mean of its divisors is an integer number (13199488641).

Almost surely, 2^26398977281 is an apocalyptic number.

It is an amenable number.

26398977281 is a deficient number, since it is larger than the sum of its proper divisors (1).

26398977281 is an equidigital number, since it uses as much as digits as its factorization.

26398977281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18289152, while the sum is 62.

The spelling of 26398977281 in words is "twenty-six billion, three hundred ninety-eight million, nine hundred seventy-seven thousand, two hundred eighty-one".