66214431109 has 2 divisors, whose sum is σ = 66214431110. Its totient is φ = 66214431108.

The previous prime is 66214431013. The next prime is 66214431187. The reversal of 66214431109 is 90113441266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58879022500 + 7335408609 = 242650^2 + 85647^2 .

It is a cyclic number.

It is not a de Polignac number, because 66214431109 - 2¹⁹ = 66213906821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66214431509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33107215554 + 33107215555.

It is an arithmetic number, because the mean of its divisors is an integer number (33107215555).

Almost surely, 2^66214431109 is an apocalyptic number.

It is an amenable number.

66214431109 is a deficient number, since it is larger than the sum of its proper divisors (1).

66214431109 is an equidigital number, since it uses as much as digits as its factorization.

66214431109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

It can be divided in two parts, 662144 and 31109, that added together give a triangular number (693253 = T₁₁₇₇).

The spelling of 66214431109 in words is "sixty-six billion, two hundred fourteen million, four hundred thirty-one thousand, one hundred nine".