81334071756 has 96 divisors (see below), whose sum is σ = 249299904000. Its totient is φ = 22436979264.

The previous prime is 81334071713. The next prime is 81334071757. The reversal of 81334071756 is 65717043318.

It is not an unprimeable number, because it can be changed into a prime (81334071757) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1832986 + ... + 1876833.

It is an arithmetic number, because the mean of its divisors is an integer number (2596874000).

Almost surely, 2^81334071756 is an apocalyptic number.

It is an amenable number.

81334071756 is an abundant number, since it is smaller than the sum of its proper divisors (167965832244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81334071756 is a wasteful number, since it uses less digits than its factorization.

81334071756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3709868 (or 3709860 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 81334071756 in words is "eighty-one billion, three hundred thirty-four million, seventy-one thousand, seven hundred fifty-six".