66116558 has 32 divisors (see below), whose sum is σ = 105284928. Its totient is φ = 31104000.

The previous prime is 66116551. The next prime is 66116563. The reversal of 66116558 is 85561166.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66116551) 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 15 ways as a sum of consecutive naturals, for example, 437783 + ... + 437933.

It is an arithmetic number, because the mean of its divisors is an integer number (3290154).

Almost surely, 2^66116558 is an apocalyptic number.

66116558 is a deficient number, since it is larger than the sum of its proper divisors (39168370).

66116558 is a wasteful number, since it uses less digits than its factorization.

66116558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348.

The product of its digits is 43200, while the sum is 38.

The square root of 66116558 is about 8131.2088892120. The cubic root of 66116558 is about 404.3617605655.

The spelling of 66116558 in words is "sixty-six million, one hundred sixteen thousand, five hundred fifty-eight".