81632725811 has 16 divisors (see below), whose sum is σ = 101681551104. Its totient is φ = 63810349344.

The previous prime is 81632725789. The next prime is 81632725861. The reversal of 81632725811 is 11852723618.

It is not a de Polignac number, because 81632725811 - 2³⁰ = 80558983987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81632725861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5396441 + ... + 5411546.

It is an arithmetic number, because the mean of its divisors is an integer number (6355096944).

Almost surely, 2^81632725811 is an apocalyptic number.

81632725811 is a deficient number, since it is larger than the sum of its proper divisors (20048825293).

81632725811 is a wasteful number, since it uses less digits than its factorization.

81632725811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10808090.

The product of its digits is 161280, while the sum is 44.

The spelling of 81632725811 in words is "eighty-one billion, six hundred thirty-two million, seven hundred twenty-five thousand, eight hundred eleven".