81343416590 has 16 divisors (see below), whose sum is σ = 146447717472. Its totient is φ = 32530796064.

The previous prime is 81343416589. The next prime is 81343416599. The reversal of 81343416590 is 9561434318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81343416599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769169 + ... + 868508.

It is an arithmetic number, because the mean of its divisors is an integer number (9152982342).

Almost surely, 2^81343416590 is an apocalyptic number.

81343416590 is a deficient number, since it is larger than the sum of its proper divisors (65104300882).

81343416590 is a wasteful number, since it uses less digits than its factorization.

81343416590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642651.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 81343416590 in words is "eighty-one billion, three hundred forty-three million, four hundred sixteen thousand, five hundred ninety".