26800135981505 has 16 divisors (see below), whose sum is σ = 32813411423184. Its totient is φ = 21008986828800.

The previous prime is 26800135981483. The next prime is 26800135981571. The reversal of 26800135981505 is 50518953100862.

It can be written as a sum of positive squares in 8 ways, for example, as 27624766849 + 26772511214656 = 166207^2 + 5174216^2 .

It is not a de Polignac number, because 26800135981505 - 2¹⁰ = 26800135980481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 273505532 + ... + 273603501.

It is an arithmetic number, because the mean of its divisors is an integer number (2050838213949).

Almost surely, 2^{26800135981505} is an apocalyptic number.

It is an amenable number.

26800135981505 is a deficient number, since it is larger than the sum of its proper divisors (6013275441679).

26800135981505 is a wasteful number, since it uses less digits than its factorization.

26800135981505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547109236.

The product of its (nonzero) digits is 2592000, while the sum is 53.

The spelling of 26800135981505 in words is "twenty-six trillion, eight hundred billion, one hundred thirty-five million, nine hundred eighty-one thousand, five hundred five".