81932334863 has 4 divisors (see below), whose sum is σ = 81933155448. Its totient is φ = 81931514280.

The previous prime is 81932334859. The next prime is 81932334881. The reversal of 81932334863 is 36843323918.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 36843323918 = 2 ⋅18421661959.

It is a cyclic number.

It is not a de Polignac number, because 81932334863 - 2² = 81932334859 is a prime.

It is a super-2 number, since 2×81932334863² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81932334893) 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, 235781 + ... + 468462.

It is an arithmetic number, because the mean of its divisors is an integer number (20483288862).

Almost surely, 2^81932334863 is an apocalyptic number.

81932334863 is a deficient number, since it is larger than the sum of its proper divisors (820585).

81932334863 is a wasteful number, since it uses less digits than its factorization.

81932334863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820584.

The product of its digits is 2239488, while the sum is 50.

The spelling of 81932334863 in words is "eighty-one billion, nine hundred thirty-two million, three hundred thirty-four thousand, eight hundred sixty-three".