81412746185 has 4 divisors (see below), whose sum is σ = 97695295428. Its totient is φ = 65130196944.

The previous prime is 81412746161. The next prime is 81412746269. The reversal of 81412746185 is 58164721418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58164721418 = 2 ⋅29082360709.

It can be written as a sum of positive squares in 2 ways, for example, as 31446638224 + 49966107961 = 177332^2 + 223531^2 .

It is a cyclic number.

It is not a de Polignac number, because 81412746185 - 2³⁴ = 64232877001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8141274614 + ... + 8141274623.

It is an arithmetic number, because the mean of its divisors is an integer number (24423823857).

Almost surely, 2^81412746185 is an apocalyptic number.

It is an amenable number.

81412746185 is a deficient number, since it is larger than the sum of its proper divisors (16282549243).

81412746185 is a wasteful number, since it uses less digits than its factorization.

81412746185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16282549242.

The product of its digits is 430080, while the sum is 47.

The spelling of 81412746185 in words is "eighty-one billion, four hundred twelve million, seven hundred forty-six thousand, one hundred eighty-five".