81143282416 has 20 divisors (see below), whose sum is σ = 179674411312. Its totient is φ = 34775692416.

The previous prime is 81143282413. The next prime is 81143282449. The reversal of 81143282416 is 61428234118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81143282413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362246685 + ... + 362246908.

Almost surely, 2^81143282416 is an apocalyptic number.

It is an amenable number.

81143282416 is an abundant number, since it is smaller than the sum of its proper divisors (98531128896).

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

81143282416 is a wasteful number, since it uses less digits than its factorization.

81143282416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724493608 (or 724493602 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The spelling of 81143282416 in words is "eighty-one billion, one hundred forty-three million, two hundred eighty-two thousand, four hundred sixteen".