81514566541517 has 8 divisors (see below), whose sum is σ = 82631547498240. Its totient is φ = 80397594856800.

The previous prime is 81514566541511. The next prime is 81514566541619. The reversal of 81514566541517 is 71514566541518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81514566541517 - 2²⁸ = 81514298106061 is a prime.

It is a super-2 number, since 2×81514566541517² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81514566541511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16415642 + ... + 20796692.

It is an arithmetic number, because the mean of its divisors is an integer number (10328943437280).

Almost surely, 2^{81514566541517} is an apocalyptic number.

It is an amenable number.

81514566541517 is a deficient number, since it is larger than the sum of its proper divisors (1116980956723).

81514566541517 is a wasteful number, since it uses less digits than its factorization.

81514566541517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4636003.

The product of its digits is 20160000, while the sum is 59.

Subtracting from 81514566541517 its reverse (71514566541518), we obtain a palindrome (9999999999999).

The spelling of 81514566541517 in words is "eighty-one trillion, five hundred fourteen billion, five hundred sixty-six million, five hundred forty-one thousand, five hundred seventeen".