81576216733 has 8 divisors (see below), whose sum is σ = 90211309056. Its totient is φ = 73144303200.

The previous prime is 81576216731. The next prime is 81576216791. The reversal of 81576216733 is 33761267518.

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 81576216733 - 2¹ = 81576216731 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81576216731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50793853 + ... + 50795458.

It is an arithmetic number, because the mean of its divisors is an integer number (11276413632).

Almost surely, 2^81576216733 is an apocalyptic number.

It is an amenable number.

81576216733 is a deficient number, since it is larger than the sum of its proper divisors (8635092323).

81576216733 is a wasteful number, since it uses less digits than its factorization.

81576216733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101589395.

The product of its digits is 1270080, while the sum is 49.

The spelling of 81576216733 in words is "eighty-one billion, five hundred seventy-six million, two hundred sixteen thousand, seven hundred thirty-three".