66310109 has 2 divisors, whose sum is σ = 66310110. Its totient is φ = 66310108.

The previous prime is 66310103. The next prime is 66310117. The reversal of 66310109 is 90101366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53728900 + 12581209 = 7330^2 + 3547^2 .

It is a cyclic number.

It is not a de Polignac number, because 66310109 - 2⁴ = 66310093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66310103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33155054 + 33155055.

It is an arithmetic number, because the mean of its divisors is an integer number (33155055).

Almost surely, 2^66310109 is an apocalyptic number.

It is an amenable number.

66310109 is a deficient number, since it is larger than the sum of its proper divisors (1).

66310109 is an equidigital number, since it uses as much as digits as its factorization.

66310109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 66310109 is about 8143.1019273984. The cubic root of 66310109 is about 404.7559551933.

The spelling of 66310109 in words is "sixty-six million, three hundred ten thousand, one hundred nine".