10818821081565 has 176 divisors, whose sum is σ = 22311892992000. Its totient is φ = 4933269017856.

The previous prime is 10818821081557. The next prime is 10818821081603. The reversal of 10818821081565 is 56518012881801.

It is not a de Polignac number, because 10818821081565 - 2³ = 10818821081557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 175 ways as a sum of consecutive naturals, for example, 845280036 + ... + 845292834.

Almost surely, 2^{10818821081565} is an apocalyptic number.

10818821081565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10818821081565 is an abundant number, since it is smaller than the sum of its proper divisors (11493071910435).

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

10818821081565 is an frugal number, since it uses more digits than its factorization.

10818821081565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13250 (or 13223 counting only the distinct ones).

The product of its (nonzero) digits is 1228800, while the sum is 54.

The spelling of 10818821081565 in words is "ten trillion, eight hundred eighteen billion, eight hundred twenty-one million, eighty-one thousand, five hundred sixty-five".