81184078045859 has 8 divisors (see below), whose sum is σ = 84714748468512. Its totient is φ = 77653484948160.

The previous prime is 81184078045831. The next prime is 81184078045877. The reversal of 81184078045859 is 95854087048118.

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

It is a cyclic number.

It is not a de Polignac number, because 81184078045859 - 2¹⁶ = 81184077980323 is a prime.

It is a super-2 number, since 2×81184078045859² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81184078095859) 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, 17180672 + ... + 21390269.

It is an arithmetic number, because the mean of its divisors is an integer number (10589343558564).

Almost surely, 2^{81184078045859} is an apocalyptic number.

81184078045859 is a deficient number, since it is larger than the sum of its proper divisors (3530670422653).

81184078045859 is a wasteful number, since it uses less digits than its factorization.

81184078045859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38662477.

The product of its (nonzero) digits is 103219200, while the sum is 68.

The spelling of 81184078045859 in words is "eighty-one trillion, one hundred eighty-four billion, seventy-eight million, forty-five thousand, eight hundred fifty-nine".