66213742 has 16 divisors (see below), whose sum is σ = 120186720. Its totient is φ = 26707968.

The previous prime is 66213739. The next prime is 66213743. The reversal of 66213742 is 24731266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66213743) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 138867 + ... + 139342.

It is an arithmetic number, because the mean of its divisors is an integer number (7511670).

Almost surely, 2^66213742 is an apocalyptic number.

66213742 is a deficient number, since it is larger than the sum of its proper divisors (53972978).

66213742 is a wasteful number, since it uses less digits than its factorization.

66213742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278235.

The product of its digits is 12096, while the sum is 31.

The square root of 66213742 is about 8137.1826819852. The cubic root of 66213742 is about 404.5597858707.

The spelling of 66213742 in words is "sixty-six million, two hundred thirteen thousand, seven hundred forty-two".