26816217681 has 32 divisors (see below), whose sum is σ = 39854592000. Its totient is φ = 15898762880.

The previous prime is 26816217619. The next prime is 26816217683. The reversal of 26816217681 is 18671261862.

It is not a de Polignac number, because 26816217681 - 2¹³ = 26816209489 is a prime.

It is a super-2 number, since 2×26816217681² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26816217681.

It is not an unprimeable number, because it can be changed into a prime (26816217683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5765845 + ... + 5770493.

It is an arithmetic number, because the mean of its divisors is an integer number (1245456000).

Almost surely, 2^26816217681 is an apocalyptic number.

It is an amenable number.

26816217681 is a deficient number, since it is larger than the sum of its proper divisors (13038374319).

26816217681 is a wasteful number, since it uses less digits than its factorization.

26816217681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8429.

The product of its digits is 387072, while the sum is 48.

The spelling of 26816217681 in words is "twenty-six billion, eight hundred sixteen million, two hundred seventeen thousand, six hundred eighty-one".