66637147 has 2 divisors, whose sum is σ = 66637148. Its totient is φ = 66637146.

The previous prime is 66637063. The next prime is 66637159. The reversal of 66637147 is 74173666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66637147 - 2¹¹ = 66635099 is a prime.

It is not a weakly prime, because it can be changed into another prime (66632147) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33318573 + 33318574.

It is an arithmetic number, because the mean of its divisors is an integer number (33318574).

Almost surely, 2^66637147 is an apocalyptic number.

66637147 is a deficient number, since it is larger than the sum of its proper divisors (1).

66637147 is an equidigital number, since it uses as much as digits as its factorization.

66637147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 40.

The square root of 66637147 is about 8163.1579061047. The cubic root of 66637147 is about 405.4202760107.

The spelling of 66637147 in words is "sixty-six million, six hundred thirty-seven thousand, one hundred forty-seven".