81489397416 has 64 divisors (see below), whose sum is σ = 232978483200. Its totient is φ = 23267521728.

The previous prime is 81489397411. The next prime is 81489397433. The reversal of 81489397416 is 61479398418.

It is a self number, because there is not a number n which added to its sum of digits gives 81489397416.

It is not an unprimeable number, because it can be changed into a prime (81489397411) 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 15 ways as a sum of consecutive naturals, for example, 102045 + ... + 416403.

It is an arithmetic number, because the mean of its divisors is an integer number (3640288800).

Almost surely, 2^81489397416 is an apocalyptic number.

It is an amenable number.

81489397416 is an abundant number, since it is smaller than the sum of its proper divisors (151489085784).

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

81489397416 is a wasteful number, since it uses less digits than its factorization.

81489397416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315918 (or 315914 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 60.

The spelling of 81489397416 in words is "eighty-one billion, four hundred eighty-nine million, three hundred ninety-seven thousand, four hundred sixteen".