26466400397 has 2 divisors, whose sum is σ = 26466400398. Its totient is φ = 26466400396.

The previous prime is 26466400351. The next prime is 26466400423. The reversal of 26466400397 is 79300466462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25368207076 + 1098193321 = 159274^2 + 33139^2 .

It is a cyclic number.

It is not a de Polignac number, because 26466400397 - 2²⁰ = 26465351821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26466400307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13233200198 + 13233200199.

It is an arithmetic number, because the mean of its divisors is an integer number (13233200199).

Almost surely, 2^26466400397 is an apocalyptic number.

It is an amenable number.

26466400397 is a deficient number, since it is larger than the sum of its proper divisors (1).

26466400397 is an equidigital number, since it uses as much as digits as its factorization.

26466400397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 47.

The spelling of 26466400397 in words is "twenty-six billion, four hundred sixty-six million, four hundred thousand, three hundred ninety-seven".