66501187 has 2 divisors, whose sum is σ = 66501188. Its totient is φ = 66501186.

The previous prime is 66501151. The next prime is 66501191. The reversal of 66501187 is 78110566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66501187 - 2¹⁹ = 65976899 is a prime.

It is not a weakly prime, because it can be changed into another prime (66531187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250593 + 33250594.

It is an arithmetic number, because the mean of its divisors is an integer number (33250594).

Almost surely, 2^66501187 is an apocalyptic number.

66501187 is a deficient number, since it is larger than the sum of its proper divisors (1).

66501187 is an equidigital number, since it uses as much as digits as its factorization.

66501187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 66501187 is about 8154.8259944649. The cubic root of 66501187 is about 405.1443614817.

The spelling of 66501187 in words is "sixty-six million, five hundred one thousand, one hundred eighty-seven".