81034723851 has 8 divisors (see below), whose sum is σ = 108067760640. Its totient is φ = 54012418152.

The previous prime is 81034723841. The next prime is 81034723879. The reversal of 81034723851 is 15832743018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81034723851 - 2⁷ = 81034723723 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81034723801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2665135 + ... + 2695368.

It is an arithmetic number, because the mean of its divisors is an integer number (13508470080).

Almost surely, 2^81034723851 is an apocalyptic number.

81034723851 is a deficient number, since it is larger than the sum of its proper divisors (27033036789).

81034723851 is a wasteful number, since it uses less digits than its factorization.

81034723851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5365545.

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 81034723851 in words is "eighty-one billion, thirty-four million, seven hundred twenty-three thousand, eight hundred fifty-one".