81565743614 has 16 divisors (see below), whose sum is σ = 122678537040. Its totient is φ = 40672948800.

The previous prime is 81565743613. The next prime is 81565743619. The reversal of 81565743614 is 41634756518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81565743613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4057889 + ... + 4077939.

It is an arithmetic number, because the mean of its divisors is an integer number (7667408565).

Almost surely, 2^81565743614 is an apocalyptic number.

81565743614 is a deficient number, since it is larger than the sum of its proper divisors (41112793426).

81565743614 is a wasteful number, since it uses less digits than its factorization.

81565743614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25435.

The product of its digits is 2419200, while the sum is 50.

The spelling of 81565743614 in words is "eighty-one billion, five hundred sixty-five million, seven hundred forty-three thousand, six hundred fourteen".