26851538331408 has 120 divisors (see below), whose sum is σ = 80697810292320. Its totient is φ = 7671278845440.

The previous prime is 26851538331407. The next prime is 26851538331427. The reversal of 26851538331408 is 80413383515862.

It is a Cunningham number, because it is equal to 5181847²-1.

It is a super-2 number, since 2×26851538331408² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26851538331407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30659268 + ... + 31522908.

It is an arithmetic number, because the mean of its divisors is an integer number (672481752436).

Almost surely, 2^{26851538331408} is an apocalyptic number.

26851538331408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

26851538331408 is an abundant number, since it is smaller than the sum of its proper divisors (53846271960912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26851538331408 is a wasteful number, since it uses less digits than its factorization.

26851538331408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876885 (or 876872 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 57.

The spelling of 26851538331408 in words is "twenty-six trillion, eight hundred fifty-one billion, five hundred thirty-eight million, three hundred thirty-one thousand, four hundred eight".