81838195683 has 48 divisors (see below), whose sum is σ = 121412422656. Its totient is φ = 48928872960.

The previous prime is 81838195643. The next prime is 81838195693. The reversal of 81838195683 is 38659183818.

It is not a de Polignac number, because 81838195683 - 2²⁰ = 81837147107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81838195613) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2399238 + ... + 2433108.

It is an arithmetic number, because the mean of its divisors is an integer number (2529425472).

Almost surely, 2^81838195683 is an apocalyptic number.

81838195683 is a deficient number, since it is larger than the sum of its proper divisors (39574226973).

81838195683 is a wasteful number, since it uses less digits than its factorization.

81838195683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34032 (or 34013 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 60.

The spelling of 81838195683 in words is "eighty-one billion, eight hundred thirty-eight million, one hundred ninety-five thousand, six hundred eighty-three".