81466693 has 8 divisors (see below), whose sum is σ = 101568960. Its totient is φ = 63480480.

The previous prime is 81466691. The next prime is 81466727. The reversal of 81466693 is 39666418.

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

It is not a de Polignac number, because 81466693 - 2¹ = 81466691 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81466691) 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, 528928 + ... + 529081.

It is an arithmetic number, because the mean of its divisors is an integer number (12696120).

Almost surely, 2^81466693 is an apocalyptic number.

It is an amenable number.

81466693 is a deficient number, since it is larger than the sum of its proper divisors (20102267).

81466693 is a wasteful number, since it uses less digits than its factorization.

81466693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058027.

The product of its digits is 186624, while the sum is 43.

The square root of 81466693 is about 9025.8901500074. The cubic root of 81466693 is about 433.5042528253.

The spelling of 81466693 in words is "eighty-one million, four hundred sixty-six thousand, six hundred ninety-three".