66772187 has 2 divisors, whose sum is σ = 66772188. Its totient is φ = 66772186.

The previous prime is 66772159. The next prime is 66772207. The reversal of 66772187 is 78127766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66772187 - 2⁸ = 66771931 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66772117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33386093 + 33386094.

It is an arithmetic number, because the mean of its divisors is an integer number (33386094).

Almost surely, 2^66772187 is an apocalyptic number.

66772187 is a deficient number, since it is larger than the sum of its proper divisors (1).

66772187 is an equidigital number, since it uses as much as digits as its factorization.

66772187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 197568, while the sum is 44.

The square root of 66772187 is about 8171.4250287205. The cubic root of 66772187 is about 405.6939522605.

The spelling of 66772187 in words is "sixty-six million, seven hundred seventy-two thousand, one hundred eighty-seven".