66211814 has 32 divisors (see below), whose sum is σ = 106375680. Its totient is φ = 30855328.

The previous prime is 66211807. The next prime is 66211823. The reversal of 66211814 is 41811266.

It is a Harshad number since it is a multiple of its sum of digits (29).

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 15 ways as a sum of consecutive naturals, for example, 291569 + ... + 291795.

It is an arithmetic number, because the mean of its divisors is an integer number (3324240).

Almost surely, 2^66211814 is an apocalyptic number.

66211814 is a deficient number, since it is larger than the sum of its proper divisors (40163866).

66211814 is a wasteful number, since it uses less digits than its factorization.

66211814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412.

The product of its digits is 2304, while the sum is 29.

The square root of 66211814 is about 8137.0642126015. The cubic root of 66211814 is about 404.5558591992. Note that the first 3 decimals are identical.

The spelling of 66211814 in words is "sixty-six million, two hundred eleven thousand, eight hundred fourteen".