66411109 has 2 divisors, whose sum is σ = 66411110. Its totient is φ = 66411108.

The previous prime is 66411091. The next prime is 66411119. The reversal of 66411109 is 90111466.

Together with previous prime (66411091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42185025 + 24226084 = 6495^2 + 4922^2 .

It is a cyclic number.

It is not a de Polignac number, because 66411109 - 2⁵ = 66411077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66411119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33205554 + 33205555.

It is an arithmetic number, because the mean of its divisors is an integer number (33205555).

Almost surely, 2^66411109 is an apocalyptic number.

It is an amenable number.

66411109 is a deficient number, since it is larger than the sum of its proper divisors (1).

66411109 is an equidigital number, since it uses as much as digits as its factorization.

66411109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 66411109 is about 8149.3011356803. The cubic root of 66411109 is about 404.9613517964.

It can be divided in two parts, 6641 and 1109, that added together give a triangular number (7750 = T₁₂₄).

The spelling of 66411109 in words is "sixty-six million, four hundred eleven thousand, one hundred nine".