66564158 has 4 divisors (see below), whose sum is σ = 99846240. Its totient is φ = 33282078.

The previous prime is 66564143. The next prime is 66564167. The reversal of 66564158 is 85146566.

It is a happy number.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 16641038 + ... + 16641041.

It is an arithmetic number, because the mean of its divisors is an integer number (24961560).

Almost surely, 2^66564158 is an apocalyptic number.

66564158 is a deficient number, since it is larger than the sum of its proper divisors (33282082).

66564158 is a wasteful number, since it uses less digits than its factorization.

66564158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33282081.

The product of its digits is 172800, while the sum is 41.

The square root of 66564158 is about 8158.6860461719. The cubic root of 66564158 is about 405.2722002882.

The spelling of 66564158 in words is "sixty-six million, five hundred sixty-four thousand, one hundred fifty-eight".