81850966 has 8 divisors (see below), whose sum is σ = 122835960. Its totient is φ = 40905648.

The previous prime is 81850961. The next prime is 81850981. The reversal of 81850966 is 66905818.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81850961) 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 3 ways as a sum of consecutive naturals, for example, 4071 + ... + 13426.

It is an arithmetic number, because the mean of its divisors is an integer number (15354495).

Almost surely, 2^81850966 is an apocalyptic number.

81850966 is a deficient number, since it is larger than the sum of its proper divisors (40984994).

81850966 is a wasteful number, since it uses less digits than its factorization.

81850966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19838.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 81850966 is about 9047.1523696686. The cubic root of 81850966 is about 434.1847875566.

The spelling of 81850966 in words is "eighty-one million, eight hundred fifty thousand, nine hundred sixty-six".