81782167185 has 40 divisors (see below), whose sum is σ = 147656900160. Its totient is φ = 43303333536.

The previous prime is 81782167151. The next prime is 81782167231. The reversal of 81782167185 is 58176128718.

It is not a de Polignac number, because 81782167185 - 2²⁰ = 81781118609 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 670077 + ... + 782666.

It is an arithmetic number, because the mean of its divisors is an integer number (3691422504).

Almost surely, 2^81782167185 is an apocalyptic number.

It is an amenable number.

81782167185 is a deficient number, since it is larger than the sum of its proper divisors (65874732975).

81782167185 is a wasteful number, since it uses less digits than its factorization.

81782167185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452899 (or 1452890 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 54.

The spelling of 81782167185 in words is "eighty-one billion, seven hundred eighty-two million, one hundred sixty-seven thousand, one hundred eighty-five".