81756596364459 has 8 divisors (see below), whose sum is σ = 109010115665472. Its totient is φ = 54503737319880.

The previous prime is 81756596364419. The next prime is 81756596364473. The reversal of 81756596364459 is 95446369565718.

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

It is not a de Polignac number, because 81756596364459 - 2²¹ = 81756594267307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81756596364419) 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 7 ways as a sum of consecutive naturals, for example, 164775109 + ... + 165270534.

It is an arithmetic number, because the mean of its divisors is an integer number (13626264458184).

Almost surely, 2^{81756596364459} is an apocalyptic number.

81756596364459 is a deficient number, since it is larger than the sum of its proper divisors (27253519301013).

81756596364459 is a wasteful number, since it uses less digits than its factorization.

81756596364459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330128217.

The product of its digits is 5878656000, while the sum is 78.

The spelling of 81756596364459 in words is "eighty-one trillion, seven hundred fifty-six billion, five hundred ninety-six million, three hundred sixty-four thousand, four hundred fifty-nine".