81717722662 has 16 divisors (see below), whose sum is σ = 122841126720. Its totient is φ = 40770730728.

The previous prime is 81717722641. The next prime is 81717722677. The reversal of 81717722662 is 26622771718.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3869889 + ... + 3890947.

It is an arithmetic number, because the mean of its divisors is an integer number (7677570420).

Almost surely, 2^81717722662 is an apocalyptic number.

81717722662 is a deficient number, since it is larger than the sum of its proper divisors (41123404058).

81717722662 is a wasteful number, since it uses less digits than its factorization.

81717722662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25155.

The product of its digits is 790272, while the sum is 49.

The spelling of 81717722662 in words is "eighty-one billion, seven hundred seventeen million, seven hundred twenty-two thousand, six hundred sixty-two".