81384806611 has 4 divisors (see below), whose sum is σ = 81414963000. Its totient is φ = 81354650224.

The previous prime is 81384806609. The next prime is 81384806681. The reversal of 81384806611 is 11660848318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81384806611 - 2¹ = 81384806609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81384806681) 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, 15074146 + ... + 15079543.

It is an arithmetic number, because the mean of its divisors is an integer number (20353740750).

Almost surely, 2^81384806611 is an apocalyptic number.

81384806611 is a deficient number, since it is larger than the sum of its proper divisors (30156389).

81384806611 is a wasteful number, since it uses less digits than its factorization.

81384806611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30156388.

The product of its (nonzero) digits is 221184, while the sum is 46.

The spelling of 81384806611 in words is "eighty-one billion, three hundred eighty-four million, eight hundred six thousand, six hundred eleven".