81481433815 has 8 divisors (see below), whose sum is σ = 97987097520. Its totient is φ = 65045562432.

The previous prime is 81481433773. The next prime is 81481433821. The reversal of 81481433815 is 51833418418.

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 81481433815 - 2¹¹ = 81481431767 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17445510 + ... + 17450179.

It is an arithmetic number, because the mean of its divisors is an integer number (12248387190).

Almost surely, 2^81481433815 is an apocalyptic number.

81481433815 is a deficient number, since it is larger than the sum of its proper divisors (16505663705).

81481433815 is a wasteful number, since it uses less digits than its factorization.

81481433815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34896161.

The product of its digits is 368640, while the sum is 46.

The spelling of 81481433815 in words is "eighty-one billion, four hundred eighty-one million, four hundred thirty-three thousand, eight hundred fifteen".