16526404518881 has 4 divisors (see below), whose sum is σ = 16526427423492. Its totient is φ = 16526381614272.

The previous prime is 16526404518857. The next prime is 16526404518919. The reversal of 16526404518881 is 18881540462561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2012468518225 + 14513936000656 = 1418615^2 + 3809716^2 .

It is a cyclic number.

It is not a de Polignac number, because 16526404518881 - 2³⁸ = 16251526611937 is a prime.

It is a super-2 number, since 2×16526404518881² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16526404518881.

It is not an unprimeable number, because it can be changed into a prime (16526404218881) 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 3 ways as a sum of consecutive naturals, for example, 10333580 + ... + 11825213.

It is an arithmetic number, because the mean of its divisors is an integer number (4131606855873).

Almost surely, 2^{16526404518881} is an apocalyptic number.

It is an amenable number.

16526404518881 is a deficient number, since it is larger than the sum of its proper divisors (22904611).

16526404518881 is an equidigital number, since it uses as much as digits as its factorization.

16526404518881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22904610.

The product of its (nonzero) digits is 14745600, while the sum is 59.

The spelling of 16526404518881 in words is "sixteen trillion, five hundred twenty-six billion, four hundred four million, five hundred eighteen thousand, eight hundred eighty-one".