81575651183 has 16 divisors (see below), whose sum is σ = 88101957216. Its totient is φ = 75085470720.

The previous prime is 81575651153. The next prime is 81575651197. The reversal of 81575651183 is 38115657518.

It is not a de Polignac number, because 81575651183 - 2¹⁸ = 81575389039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81575651153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11123828 + ... + 11131158.

It is an arithmetic number, because the mean of its divisors is an integer number (5506372326).

Almost surely, 2^81575651183 is an apocalyptic number.

81575651183 is a deficient number, since it is larger than the sum of its proper divisors (6526306033).

81575651183 is a wasteful number, since it uses less digits than its factorization.

81575651183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9674.

The product of its digits is 1008000, while the sum is 50.

The spelling of 81575651183 in words is "eighty-one billion, five hundred seventy-five million, six hundred fifty-one thousand, one hundred eighty-three".