81682122615 has 32 divisors (see below), whose sum is σ = 137730827520. Its totient is φ = 41222686464.

The previous prime is 81682122581. The next prime is 81682122623. The reversal of 81682122615 is 51622128618.

It is not a de Polignac number, because 81682122615 - 2²⁰ = 81681074039 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 77032 + ... + 411458.

It is an arithmetic number, because the mean of its divisors is an integer number (4304088360).

Almost surely, 2^81682122615 is an apocalyptic number.

81682122615 is a deficient number, since it is larger than the sum of its proper divisors (56048704905).

81682122615 is a wasteful number, since it uses less digits than its factorization.

81682122615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335311.

The product of its digits is 92160, while the sum is 42.

The spelling of 81682122615 in words is "eighty-one billion, six hundred eighty-two million, one hundred twenty-two thousand, six hundred fifteen".