81593102236 has 24 divisors (see below), whose sum is σ = 147472855040. Its totient is φ = 39459409200.

The previous prime is 81593102231. The next prime is 81593102243. The reversal of 81593102236 is 63220139518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81593102231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57901 + ... + 408091.

Almost surely, 2^81593102236 is an apocalyptic number.

It is an amenable number.

81593102236 is a deficient number, since it is larger than the sum of its proper divisors (65879752804).

81593102236 is a wasteful number, since it uses less digits than its factorization.

81593102236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352105 (or 352103 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 81593102236 in words is "eighty-one billion, five hundred ninety-three million, one hundred two thousand, two hundred thirty-six".