81144444083 has 2 divisors, whose sum is σ = 81144444084. Its totient is φ = 81144444082.

The previous prime is 81144444079. The next prime is 81144444119. The reversal of 81144444083 is 38044444118.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81144444083 - 2² = 81144444079 is a prime.

It is a super-2 number, since 2×81144444083² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81144444083.

It is not a weakly prime, because it can be changed into another prime (81144444583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40572222041 + 40572222042.

It is an arithmetic number, because the mean of its divisors is an integer number (40572222042).

Almost surely, 2^81144444083 is an apocalyptic number.

81144444083 is a deficient number, since it is larger than the sum of its proper divisors (1).

81144444083 is an equidigital number, since it uses as much as digits as its factorization.

81144444083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196608, while the sum is 41.

The spelling of 81144444083 in words is "eighty-one billion, one hundred forty-four million, four hundred forty-four thousand, eighty-three".