66355442 has 8 divisors (see below), whose sum is σ = 99597036. Its totient is φ = 33156432.

The previous prime is 66355441. The next prime is 66355447. The reversal of 66355442 is 24455366.

It is a happy number.

66355442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 65431921 + 923521 = 8089^2 + 961^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66355441) 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 3 ways as a sum of consecutive naturals, for example, 6413 + ... + 13184.

Almost surely, 2^66355442 is an apocalyptic number.

66355442 is a deficient number, since it is larger than the sum of its proper divisors (33241594).

66355442 is a wasteful number, since it uses less digits than its factorization.

66355442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21292.

The product of its digits is 86400, while the sum is 35.

The square root of 66355442 is about 8145.8849734084. The cubic root of 66355442 is about 404.8481715093.

The spelling of 66355442 in words is "sixty-six million, three hundred fifty-five thousand, four hundred forty-two".