81746064718 has 16 divisors (see below), whose sum is σ = 124114757760. Its totient is φ = 40374624376.

The previous prime is 81746064713. The next prime is 81746064791.

81746064718 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81746064713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1222221 + ... + 1287367.

It is an arithmetic number, because the mean of its divisors is an integer number (7757172360).

Almost surely, 2^81746064718 is an apocalyptic number.

81746064718 is a deficient number, since it is larger than the sum of its proper divisors (42368693042).

81746064718 is a wasteful number, since it uses less digits than its factorization.

81746064718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72791.

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 81746064718 in words is "eighty-one billion, seven hundred forty-six million, sixty-four thousand, seven hundred eighteen".