81716712657745 has 8 divisors (see below), whose sum is σ = 106974605661120. Its totient is φ = 59430336478320.

The previous prime is 81716712657733. The next prime is 81716712657787. The reversal of 81716712657745 is 54775621761718.

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

It is not a de Polignac number, because 81716712657745 - 2⁴³ = 72920619635537 is a prime.

It is a super-2 number, since 2×81716712657745² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 742879205925 + ... + 742879206034.

It is an arithmetic number, because the mean of its divisors is an integer number (13371825707640).

Almost surely, 2^{81716712657745} is an apocalyptic number.

It is an amenable number.

81716712657745 is a deficient number, since it is larger than the sum of its proper divisors (25257893003375).

81716712657745 is a wasteful number, since it uses less digits than its factorization.

81716712657745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485758411975.

The product of its digits is 138297600, while the sum is 67.

The spelling of 81716712657745 in words is "eighty-one trillion, seven hundred sixteen billion, seven hundred twelve million, six hundred fifty-seven thousand, seven hundred forty-five".