26178118397 has 2 divisors, whose sum is σ = 26178118398. Its totient is φ = 26178118396.

The previous prime is 26178118349. The next prime is 26178118399. The reversal of 26178118397 is 79381187162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24215716996 + 1962401401 = 155614^2 + 44299^2 .

It is a cyclic number.

It is not a de Polignac number, because 26178118397 - 2²⁴ = 26161341181 is a prime.

Together with 26178118399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26178118399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13089059198 + 13089059199.

It is an arithmetic number, because the mean of its divisors is an integer number (13089059199).

Almost surely, 2^26178118397 is an apocalyptic number.

It is an amenable number.

26178118397 is a deficient number, since it is larger than the sum of its proper divisors (1).

26178118397 is an equidigital number, since it uses as much as digits as its factorization.

26178118397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 53.

The spelling of 26178118397 in words is "twenty-six billion, one hundred seventy-eight million, one hundred eighteen thousand, three hundred ninety-seven".