66211518 has 8 divisors (see below), whose sum is σ = 132423048. Its totient is φ = 22070504.

The previous prime is 66211499. The next prime is 66211591. The reversal of 66211518 is 81511266.

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

66211518 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5517621 + ... + 5517632.

It is an arithmetic number, because the mean of its divisors is an integer number (16552881).

Almost surely, 2^66211518 is an apocalyptic number.

66211518 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66211518 is a wasteful number, since it uses less digits than its factorization.

66211518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11035258.

The product of its digits is 2880, while the sum is 30.

The square root of 66211518 is about 8137.0460242031. The cubic root of 66211518 is about 404.5552563424. Note that the first 3 decimals are identical.

The spelling of 66211518 in words is "sixty-six million, two hundred eleven thousand, five hundred eighteen".