81533005305 has 8 divisors (see below), whose sum is σ = 130452808512. Its totient is φ = 43484269488.

The previous prime is 81533005291. The next prime is 81533005313. The reversal of 81533005305 is 50350033518.

It is a happy number.

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

It is not a de Polignac number, because 81533005305 - 2¹⁵ = 81532972537 is a prime.

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, 2717766829 + ... + 2717766858.

It is an arithmetic number, because the mean of its divisors is an integer number (16306601064).

Almost surely, 2^81533005305 is an apocalyptic number.

It is an amenable number.

81533005305 is a deficient number, since it is larger than the sum of its proper divisors (48919803207).

81533005305 is a wasteful number, since it uses less digits than its factorization.

81533005305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5435533695.

The product of its (nonzero) digits is 27000, while the sum is 33.

The spelling of 81533005305 in words is "eighty-one billion, five hundred thirty-three million, five thousand, three hundred five".