66158137 has 2 divisors, whose sum is σ = 66158138. Its totient is φ = 66158136.

The previous prime is 66158119. The next prime is 66158149. The reversal of 66158137 is 73185166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52475536 + 13682601 = 7244^2 + 3699^2 .

It is a cyclic number.

It is not a de Polignac number, because 66158137 - 2¹¹ = 66156089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66158096 and 66158105.

It is not a weakly prime, because it can be changed into another prime (66158167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33079068 + 33079069.

It is an arithmetic number, because the mean of its divisors is an integer number (33079069).

Almost surely, 2^66158137 is an apocalyptic number.

It is an amenable number.

66158137 is a deficient number, since it is larger than the sum of its proper divisors (1).

66158137 is an equidigital number, since it uses as much as digits as its factorization.

66158137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 66158137 is about 8133.7652412643. The cubic root of 66158137 is about 404.4465070343.

It can be divided in two parts, 66 and 158137, that added together give a triangular number (158203 = T₅₆₂).

The spelling of 66158137 in words is "sixty-six million, one hundred fifty-eight thousand, one hundred thirty-seven".