81816683 has 8 divisors (see below), whose sum is σ = 89773488. Its totient is φ = 74097504.

The previous prime is 81816671. The next prime is 81816703. The reversal of 81816683 is 38661818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81816683 - 2⁴ = 81816667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81816683.

It is not an unprimeable number, because it can be changed into a prime (81816643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58685 + ... + 60062.

It is an arithmetic number, because the mean of its divisors is an integer number (11221686).

Almost surely, 2^81816683 is an apocalyptic number.

81816683 is a deficient number, since it is larger than the sum of its proper divisors (7956805).

81816683 is a wasteful number, since it uses less digits than its factorization.

81816683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118813.

The product of its digits is 55296, while the sum is 41.

The square root of 81816683 is about 9045.2574866612. The cubic root of 81816683 is about 434.1241601485.

The spelling of 81816683 in words is "eighty-one million, eight hundred sixteen thousand, six hundred eighty-three".