81555841334 has 16 divisors (see below), whose sum is σ = 135062907840. Its totient is φ = 36624199560.

The previous prime is 81555841313. The next prime is 81555841337. The reversal of 81555841334 is 43314855518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81555841337) 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, 22330004 + ... + 22333655.

It is an arithmetic number, because the mean of its divisors is an integer number (8441431740).

Almost surely, 2^81555841334 is an apocalyptic number.

81555841334 is a deficient number, since it is larger than the sum of its proper divisors (53507066506).

81555841334 is a wasteful number, since it uses less digits than its factorization.

81555841334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44663755.

The product of its digits is 1152000, while the sum is 47.

The spelling of 81555841334 in words is "eighty-one billion, five hundred fifty-five million, eight hundred forty-one thousand, three hundred thirty-four".