81167732611 has 24 divisors (see below), whose sum is σ = 97374384096. Its totient is φ = 67410766080.

The previous prime is 81167732593. The next prime is 81167732623. The reversal of 81167732611 is 11623776118.

It is not a de Polignac number, because 81167732611 - 2¹⁹ = 81167208323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81167712611) 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, 344050 + ... + 529816.

It is an arithmetic number, because the mean of its divisors is an integer number (4057266004).

Almost surely, 2^81167732611 is an apocalyptic number.

81167732611 is a deficient number, since it is larger than the sum of its proper divisors (16206651485).

81167732611 is a wasteful number, since it uses less digits than its factorization.

81167732611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186059 (or 186052 counting only the distinct ones).

The product of its digits is 84672, while the sum is 43.

The spelling of 81167732611 in words is "eighty-one billion, one hundred sixty-seven million, seven hundred thirty-two thousand, six hundred eleven".