81844487182 has 16 divisors (see below), whose sum is σ = 124884342000. Its totient is φ = 40216782400.

The previous prime is 81844487173. The next prime is 81844487189. The reversal of 81844487182 is 28178444818.

It is a super-2 number, since 2×81844487182² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81844487189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306432 + ... + 507532.

It is an arithmetic number, because the mean of its divisors is an integer number (7805271375).

Almost surely, 2^81844487182 is an apocalyptic number.

81844487182 is a deficient number, since it is larger than the sum of its proper divisors (43039854818).

81844487182 is a wasteful number, since it uses less digits than its factorization.

81844487182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204611.

The product of its digits is 3670016, while the sum is 55.

The spelling of 81844487182 in words is "eighty-one billion, eight hundred forty-four million, four hundred eighty-seven thousand, one hundred eighty-two".