66010909 has 2 divisors, whose sum is σ = 66010910. Its totient is φ = 66010908.

The previous prime is 66010877. The next prime is 66010927. The reversal of 66010909 is 90901066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63154809 + 2856100 = 7947^2 + 1690^2 .

It is a cyclic number.

It is not a de Polignac number, because 66010909 - 2⁵ = 66010877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66010939) 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, 33005454 + 33005455.

It is an arithmetic number, because the mean of its divisors is an integer number (33005455).

Almost surely, 2^66010909 is an apocalyptic number.

It is an amenable number.

66010909 is a deficient number, since it is larger than the sum of its proper divisors (1).

66010909 is an equidigital number, since it uses as much as digits as its factorization.

66010909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 66010909 is about 8124.7097794321. The cubic root of 66010909 is about 404.1462664353.

The spelling of 66010909 in words is "sixty-six million, ten thousand, nine hundred nine".