81223080185 has 16 divisors (see below), whose sum is σ = 104979732480. Its totient is φ = 59971823040.

The previous prime is 81223080167. The next prime is 81223080269. The reversal of 81223080185 is 58108032218.

It is a happy number.

It is not a de Polignac number, because 81223080185 - 2⁶ = 81223080121 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408680 + ... + 573990.

It is an arithmetic number, because the mean of its divisors is an integer number (6561233280).

Almost surely, 2^81223080185 is an apocalyptic number.

It is an amenable number.

81223080185 is a deficient number, since it is larger than the sum of its proper divisors (23756652295).

81223080185 is a wasteful number, since it uses less digits than its factorization.

81223080185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172888.

The product of its (nonzero) digits is 30720, while the sum is 38.

The spelling of 81223080185 in words is "eighty-one billion, two hundred twenty-three million, eighty thousand, one hundred eighty-five".