81364877846319 has 16 divisors (see below), whose sum is σ = 108572940403200. Its totient is φ = 54200050001856.

The previous prime is 81364877846279. The next prime is 81364877846339. The reversal of 81364877846319 is 91364877846318.

It is not a de Polignac number, because 81364877846319 - 2¹⁶ = 81364877780783 is a prime.

It is a super-2 number, since 2×81364877846319² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81364877846339) 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 15 ways as a sum of consecutive naturals, for example, 17812092 + ... + 21908910.

It is an arithmetic number, because the mean of its divisors is an integer number (6785808775200).

Almost surely, 2^{81364877846319} is an apocalyptic number.

81364877846319 is a deficient number, since it is larger than the sum of its proper divisors (27208062556881).

81364877846319 is a wasteful number, since it uses less digits than its factorization.

81364877846319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4102094.

The product of its digits is 1170505728, while the sum is 75.

Subtracting 81364877846319 from its reverse (91364877846318), we obtain a palindrome (9999999999999).

The spelling of 81364877846319 in words is "eighty-one trillion, three hundred sixty-four billion, eight hundred seventy-seven million, eight hundred forty-six thousand, three hundred nineteen".