81217102576999 has 4 divisors (see below), whose sum is σ = 84748280949936. Its totient is φ = 77685924204064.

The previous prime is 81217102576991. The next prime is 81217102577003. The reversal of 81217102576999 is 99967520171218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81217102576999 - 2³ = 81217102576991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81217102576991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1765589186434 + ... + 1765589186479.

It is an arithmetic number, because the mean of its divisors is an integer number (21187070237484).

Almost surely, 2^{81217102576999} is an apocalyptic number.

81217102576999 is a deficient number, since it is larger than the sum of its proper divisors (3531178372937).

81217102576999 is a wasteful number, since it uses less digits than its factorization.

81217102576999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3531178372936.

The product of its (nonzero) digits is 34292160, while the sum is 67.

The spelling of 81217102576999 in words is "eighty-one trillion, two hundred seventeen billion, one hundred two million, five hundred seventy-six thousand, nine hundred ninety-nine".