66538118 has 8 divisors (see below), whose sum is σ = 99975600. Its totient is φ = 33212920.

The previous prime is 66538117. The next prime is 66538141. The reversal of 66538118 is 81183566.

It is a happy number.

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

It is a super-2 number, since 2×66538118² = 8854642293963848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66538117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26573 + ... + 28968.

It is an arithmetic number, because the mean of its divisors is an integer number (12496950).

Almost surely, 2^66538118 is an apocalyptic number.

66538118 is a deficient number, since it is larger than the sum of its proper divisors (33437482).

66538118 is a wasteful number, since it uses less digits than its factorization.

66538118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56142.

The product of its digits is 34560, while the sum is 38.

The square root of 66538118 is about 8157.0900448628. The cubic root of 66538118 is about 405.2193456947.

It can be divided in two parts, 665 and 38118, that added together give a palindrome (38783).

The spelling of 66538118 in words is "sixty-six million, five hundred thirty-eight thousand, one hundred eighteen".