81159715334 has 32 divisors (see below), whose sum is σ = 129804892416. Its totient is φ = 37925222400.

The previous prime is 81159715331. The next prime is 81159715387. The reversal of 81159715334 is 43351795118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81159715331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10410542 + ... + 10418334.

It is an arithmetic number, because the mean of its divisors is an integer number (4056402888).

Almost surely, 2^81159715334 is an apocalyptic number.

81159715334 is a deficient number, since it is larger than the sum of its proper divisors (48645177082).

81159715334 is a wasteful number, since it uses less digits than its factorization.

81159715334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9920.

The product of its digits is 453600, while the sum is 47.

The spelling of 81159715334 in words is "eighty-one billion, one hundred fifty-nine million, seven hundred fifteen thousand, three hundred thirty-four".