26388887638889 has 4 divisors (see below), whose sum is σ = 26722924191360. Its totient is φ = 26054851086420.

The previous prime is 26388887638859. The next prime is 26388887638891. The reversal of 26388887638889 is 98883678888362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26388887638889 is a prime.

It is a super-2 number, since 2×26388887638889² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26388887638798 and 26388887638807.

It is not an unprimeable number, because it can be changed into a prime (26388887638849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167018276117 + ... + 167018276274.

It is an arithmetic number, because the mean of its divisors is an integer number (6680731047840).

Almost surely, 2^{26388887638889} is an apocalyptic number.

It is an amenable number.

26388887638889 is a deficient number, since it is larger than the sum of its proper divisors (334036552471).

26388887638889 is an equidigital number, since it uses as much as digits as its factorization.

26388887638889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334036552470.

The product of its digits is 85614133248, while the sum is 92.

The spelling of 26388887638889 in words is "twenty-six trillion, three hundred eighty-eight billion, eight hundred eighty-seven million, six hundred thirty-eight thousand, eight hundred eighty-nine".