81611147233 has 24 divisors (see below), whose sum is σ = 104984670240. Its totient is φ = 62721933120.

The previous prime is 81611147231. The next prime is 81611147237. The reversal of 81611147233 is 33274111618.

It is not a de Polignac number, because 81611147233 - 2¹ = 81611147231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81611147192 and 81611147201.

It is not an unprimeable number, because it can be changed into a prime (81611147231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 997723 + ... + 1076416.

It is an arithmetic number, because the mean of its divisors is an integer number (4374361260).

Almost surely, 2^81611147233 is an apocalyptic number.

It is an amenable number.

81611147233 is a deficient number, since it is larger than the sum of its proper divisors (23373523007).

81611147233 is a wasteful number, since it uses less digits than its factorization.

81611147233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074237 (or 2074230 counting only the distinct ones).

The product of its digits is 24192, while the sum is 37.

The spelling of 81611147233 in words is "eighty-one billion, six hundred eleven million, one hundred forty-seven thousand, two hundred thirty-three".