81840017734 has 32 divisors (see below), whose sum is σ = 127857864960. Its totient is φ = 39263713632.

The previous prime is 81840017717. The next prime is 81840017741. The reversal of 81840017734 is 43771004818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 945727 + ... + 1028629.

It is an arithmetic number, because the mean of its divisors is an integer number (3995558280).

Almost surely, 2^81840017734 is an apocalyptic number.

81840017734 is a deficient number, since it is larger than the sum of its proper divisors (46017847226).

81840017734 is a wasteful number, since it uses less digits than its factorization.

81840017734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83164.

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 81840017734 in words is "eighty-one billion, eight hundred forty million, seventeen thousand, seven hundred thirty-four".