26668521293 has 2 divisors, whose sum is σ = 26668521294. Its totient is φ = 26668521292.

The previous prime is 26668521281. The next prime is 26668521329. The reversal of 26668521293 is 39212586662.

Together with next prime (26668521329) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25778871364 + 889649929 = 160558^2 + 29827^2 .

It is a cyclic number.

It is not a de Polignac number, because 26668521293 - 2²⁶ = 26601412429 is a prime.

It is a super-2 number, since 2×26668521293² (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 (26668521233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13334260646 + 13334260647.

It is an arithmetic number, because the mean of its divisors is an integer number (13334260647).

Almost surely, 2^26668521293 is an apocalyptic number.

It is an amenable number.

26668521293 is a deficient number, since it is larger than the sum of its proper divisors (1).

26668521293 is an equidigital number, since it uses as much as digits as its factorization.

26668521293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 50.

The spelling of 26668521293 in words is "twenty-six billion, six hundred sixty-eight million, five hundred twenty-one thousand, two hundred ninety-three".