81192822896639 has 16 divisors (see below), whose sum is σ = 83498525222400. Its totient is φ = 78918144588096.

The previous prime is 81192822896593. The next prime is 81192822896683. The reversal of 81192822896639 is 93669822829118.

It is a cyclic number.

It is not a de Polignac number, because 81192822896639 - 2¹⁶ = 81192822831103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81192822896039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289520762 + ... + 289801064.

It is an arithmetic number, because the mean of its divisors is an integer number (5218657826400).

Almost surely, 2^{81192822896639} is an apocalyptic number.

81192822896639 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

81192822896639 is a deficient number, since it is larger than the sum of its proper divisors (2305702325761).

81192822896639 is a wasteful number, since it uses less digits than its factorization.

81192822896639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335614.

The product of its digits is 322486272, while the sum is 74.

The spelling of 81192822896639 in words is "eighty-one trillion, one hundred ninety-two billion, eight hundred twenty-two million, eight hundred ninety-six thousand, six hundred thirty-nine".