26666962981 has 2 divisors, whose sum is σ = 26666962982. Its totient is φ = 26666962980.

The previous prime is 26666962969. The next prime is 26666963009. The reversal of 26666962981 is 18926966662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16839214756 + 9827748225 = 129766^2 + 99135^2 .

It is a cyclic number.

It is not a de Polignac number, because 26666962981 - 2¹³ = 26666954789 is a prime.

It is a super-2 number, since 2×26666962981² (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 (26666962181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13333481490 + 13333481491.

It is an arithmetic number, because the mean of its divisors is an integer number (13333481491).

Almost surely, 2^26666962981 is an apocalyptic number.

It is an amenable number.

26666962981 is a deficient number, since it is larger than the sum of its proper divisors (1).

26666962981 is an equidigital number, since it uses as much as digits as its factorization.

26666962981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20155392, while the sum is 61.

The spelling of 26666962981 in words is "twenty-six billion, six hundred sixty-six million, nine hundred sixty-two thousand, nine hundred eighty-one".