81464595675813 has 72 divisors (see below), whose sum is σ = 142134219542016. Its totient is φ = 44038214136000.

The previous prime is 81464595675811. The next prime is 81464595675829. The reversal of 81464595675813 is 31857659546418.

81464595675813 is a `hidden beast` number, since 8 + 1 + 4 + 6 + 4 + 5 + 9 + 567 + 58 + 1 + 3 = 666.

It is not a de Polignac number, because 81464595675813 - 2¹ = 81464595675811 is a prime.

It is a super-3 number, since 3×81464595675813³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81464595675811) 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 71 ways as a sum of consecutive naturals, for example, 13387948 + ... + 18497738.

It is an arithmetic number, because the mean of its divisors is an integer number (1974086382528).

Almost surely, 2^{81464595675813} is an apocalyptic number.

It is an amenable number.

81464595675813 is a deficient number, since it is larger than the sum of its proper divisors (60669623866203).

81464595675813 is a wasteful number, since it uses less digits than its factorization.

81464595675813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5110543 (or 5110521 counting only the distinct ones).

The product of its digits is 870912000, while the sum is 72.

The spelling of 81464595675813 in words is "eighty-one trillion, four hundred sixty-four billion, five hundred ninety-five million, six hundred seventy-five thousand, eight hundred thirteen".