81839793195 has 24 divisors (see below), whose sum is σ = 141862664736. Its totient is φ = 43645728768.

The previous prime is 81839793181. The next prime is 81839793221. The reversal of 81839793195 is 59139793818.

It is not a de Polignac number, because 81839793195 - 2⁴ = 81839793179 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1346962 + ... + 1406408.

It is an arithmetic number, because the mean of its divisors is an integer number (5910944364).

Almost surely, 2^81839793195 is an apocalyptic number.

81839793195 is a deficient number, since it is larger than the sum of its proper divisors (60022871541).

81839793195 is a wasteful number, since it uses less digits than its factorization.

81839793195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90051 (or 90048 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 63.

It can be divided in two parts, 8183 and 9793195, that added together give a triangular number (9801378 = T₄₄₂₇).

The spelling of 81839793195 in words is "eighty-one billion, eight hundred thirty-nine million, seven hundred ninety-three thousand, one hundred ninety-five".