66138158 has 8 divisors (see below), whose sum is σ = 99274152. Its totient is φ = 33046776.

The previous prime is 66138157. The next prime is 66138167. The reversal of 66138158 is 85183166.

It is a happy number.

66138158 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66138157) 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, 7160 + ... + 13547.

It is an arithmetic number, because the mean of its divisors is an integer number (12409269).

Almost surely, 2^66138158 is an apocalyptic number.

66138158 is a deficient number, since it is larger than the sum of its proper divisors (33135994).

66138158 is a wasteful number, since it uses less digits than its factorization.

66138158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22306.

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

The square root of 66138158 is about 8132.5369965344. The cubic root of 66138158 is about 404.4057901970.

The spelling of 66138158 in words is "sixty-six million, one hundred thirty-eight thousand, one hundred fifty-eight".