26671388389 has 2 divisors, whose sum is σ = 26671388390. Its totient is φ = 26671388388.

The previous prime is 26671388357. The next prime is 26671388411. The reversal of 26671388389 is 98388317662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26063519364 + 607869025 = 161442^2 + 24655^2 .

It is a cyclic number.

It is not a de Polignac number, because 26671388389 - 2⁵ = 26671388357 is a prime.

It is a super-2 number, since 2×26671388389² (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 (26671388089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13335694194 + 13335694195.

It is an arithmetic number, because the mean of its divisors is an integer number (13335694195).

Almost surely, 2^26671388389 is an apocalyptic number.

It is an amenable number.

26671388389 is a deficient number, since it is larger than the sum of its proper divisors (1).

26671388389 is an equidigital number, since it uses as much as digits as its factorization.

26671388389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20901888, while the sum is 61.

The spelling of 26671388389 in words is "twenty-six billion, six hundred seventy-one million, three hundred eighty-eight thousand, three hundred eighty-nine".