81466418 has 8 divisors (see below), whose sum is σ = 133308720. Its totient is φ = 37030180.

The previous prime is 81466393. The next prime is 81466453.

81466418 is nontrivially palindromic in base 10.

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

It is a Curzon 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, 1851488 + ... + 1851531.

It is an arithmetic number, because the mean of its divisors is an integer number (16663590).

Almost surely, 2^81466418 is an apocalyptic number.

81466418 is a deficient number, since it is larger than the sum of its proper divisors (51842302).

81466418 is a wasteful number, since it uses less digits than its factorization.

81466418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703032.

The product of its digits is 36864, while the sum is 38.

The square root of 81466418 is about 9025.8749160400. The cubic root of 81466418 is about 433.5037650439.

The spelling of 81466418 in words is "eighty-one million, four hundred sixty-six thousand, four hundred eighteen".