26438197170391 has 2 divisors, whose sum is σ = 26438197170392. Its totient is φ = 26438197170390.

The previous prime is 26438197170367. The next prime is 26438197170421. The reversal of 26438197170391 is 19307179183462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26438197170391 - 2¹³ = 26438197162199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26438197170361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13219098585195 + 13219098585196.

It is an arithmetic number, because the mean of its divisors is an integer number (13219098585196).

Almost surely, 2^{26438197170391} is an apocalyptic number.

26438197170391 is a deficient number, since it is larger than the sum of its proper divisors (1).

26438197170391 is an equidigital number, since it uses as much as digits as its factorization.

26438197170391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13716864, while the sum is 61.

The spelling of 26438197170391 in words is "twenty-six trillion, four hundred thirty-eight billion, one hundred ninety-seven million, one hundred seventy thousand, three hundred ninety-one".