81844461763 has 4 divisors (see below), whose sum is σ = 81856165840. Its totient is φ = 81832757688.

The previous prime is 81844461739. The next prime is 81844461773. The reversal of 81844461763 is 36716444818.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81844461763 - 2¹⁷ = 81844330691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81844461763.

It is not an unprimeable number, because it can be changed into a prime (81844461733) 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 3 ways as a sum of consecutive naturals, for example, 5841543 + ... + 5855536.

It is an arithmetic number, because the mean of its divisors is an integer number (20464041460).

Almost surely, 2^81844461763 is an apocalyptic number.

81844461763 is a deficient number, since it is larger than the sum of its proper divisors (11704077).

81844461763 is a wasteful number, since it uses less digits than its factorization.

81844461763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11704076.

The product of its digits is 3096576, while the sum is 52.

The spelling of 81844461763 in words is "eighty-one billion, eight hundred forty-four million, four hundred sixty-one thousand, seven hundred sixty-three".