81593236067 has 12 divisors (see below), whose sum is σ = 96116035680. Its totient is φ = 69051776976.

The previous prime is 81593236003. The next prime is 81593236103. The reversal of 81593236067 is 76063239518.

It is not a de Polignac number, because 81593236067 - 2⁶ = 81593236003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81593236367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10535168 + ... + 10542909.

It is an arithmetic number, because the mean of its divisors is an integer number (8009669640).

Almost surely, 2^81593236067 is an apocalyptic number.

81593236067 is a deficient number, since it is larger than the sum of its proper divisors (14522799613).

81593236067 is a wasteful number, since it uses less digits than its factorization.

81593236067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21078170 (or 21078163 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 81593236067 in words is "eighty-one billion, five hundred ninety-three million, two hundred thirty-six thousand, sixty-seven".