81542444814 has 24 divisors (see below), whose sum is σ = 176783950200. Its totient is φ = 27164099088.

The previous prime is 81542444813. The next prime is 81542444821. The reversal of 81542444814 is 41844424518.

It is a happy number.

81542444814 is a `hidden beast` number, since 81 + 54 + 2 + 44 + 481 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 81542444814.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81542444813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1362889 + ... + 1421460.

It is an arithmetic number, because the mean of its divisors is an integer number (7365997925).

Almost surely, 2^81542444814 is an apocalyptic number.

81542444814 is an abundant number, since it is smaller than the sum of its proper divisors (95241505386).

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

81542444814 is a wasteful number, since it uses less digits than its factorization.

81542444814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2785984 (or 2785981 counting only the distinct ones).

The product of its digits is 655360, while the sum is 45.

The spelling of 81542444814 in words is "eighty-one billion, five hundred forty-two million, four hundred forty-four thousand, eight hundred fourteen".