81852122663 has 16 divisors (see below), whose sum is σ = 83245003776. Its totient is φ = 80473258080.

The previous prime is 81852122659. The next prime is 81852122687. The reversal of 81852122663 is 36622125818.

It is a cyclic number.

It is not a de Polignac number, because 81852122663 - 2² = 81852122659 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 (81852122633) 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, 7620845 + ... + 7631577.

It is an arithmetic number, because the mean of its divisors is an integer number (5202812736).

Almost surely, 2^81852122663 is an apocalyptic number.

81852122663 is a deficient number, since it is larger than the sum of its proper divisors (1392881113).

81852122663 is a wasteful number, since it uses less digits than its factorization.

81852122663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11374.

The product of its digits is 276480, while the sum is 44.

The spelling of 81852122663 in words is "eighty-one billion, eight hundred fifty-two million, one hundred twenty-two thousand, six hundred sixty-three".