66155137 has 2 divisors, whose sum is σ = 66155138. Its totient is φ = 66155136.

The previous prime is 66155129. The next prime is 66155191. The reversal of 66155137 is 73155166.

66155137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61528336 + 4626801 = 7844^2 + 2151^2 .

It is a cyclic number.

It is not a de Polignac number, because 66155137 - 2³ = 66155129 is a prime.

It is not a weakly prime, because it can be changed into another prime (66155237) 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 as a sum of consecutive naturals, namely, 33077568 + 33077569.

It is an arithmetic number, because the mean of its divisors is an integer number (33077569).

Almost surely, 2^66155137 is an apocalyptic number.

It is an amenable number.

66155137 is a deficient number, since it is larger than the sum of its proper divisors (1).

66155137 is an equidigital number, since it uses as much as digits as its factorization.

66155137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900, while the sum is 34.

The square root of 66155137 is about 8133.5808227373. The cubic root of 66155137 is about 404.4403936121.

The spelling of 66155137 in words is "sixty-six million, one hundred fifty-five thousand, one hundred thirty-seven".