81345449814 has 12 divisors (see below), whose sum is σ = 162692296884. Its totient is φ = 27114917064.

The previous prime is 81345449747. The next prime is 81345449833. The reversal of 81345449814 is 41894454318.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 640404 + ... + 756840.

It is an arithmetic number, because the mean of its divisors is an integer number (13557691407).

Almost surely, 2^81345449814 is an apocalyptic number.

81345449814 is an abundant number, since it is smaller than the sum of its proper divisors (81346847070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81345449814 is an frugal number, since it uses more digits than its factorization.

81345449814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232879 (or 116442 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 51.

The spelling of 81345449814 in words is "eighty-one billion, three hundred forty-five million, four hundred forty-nine thousand, eight hundred fourteen".