66155138 has 16 divisors (see below), whose sum is σ = 114039744. Its totient is φ = 28194480.

The previous prime is 66155137. The next prime is 66155191. The reversal of 66155138 is 83155166.

66155138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 66155098 and 66155107.

It is not an unprimeable number, because it can be changed into a prime (66155137) 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 7 ways as a sum of consecutive naturals, for example, 10520 + ... + 15587.

It is an arithmetic number, because the mean of its divisors is an integer number (7127484).

Almost surely, 2^66155138 is an apocalyptic number.

66155138 is a deficient number, since it is larger than the sum of its proper divisors (47884606).

66155138 is a wasteful number, since it uses less digits than its factorization.

66155138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26297.

The product of its digits is 21600, while the sum is 35.

The square root of 66155138 is about 8133.5808842108. The cubic root of 66155138 is about 404.4403956500.

The spelling of 66155138 in words is "sixty-six million, one hundred fifty-five thousand, one hundred thirty-eight".