66271189 has 2 divisors, whose sum is σ = 66271190. Its totient is φ = 66271188.

The previous prime is 66271103. The next prime is 66271201. The reversal of 66271189 is 98117266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61496964 + 4774225 = 7842^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 66271189 - 2²⁵ = 32716757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66271489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33135594 + 33135595.

It is an arithmetic number, because the mean of its divisors is an integer number (33135595).

Almost surely, 2^66271189 is an apocalyptic number.

It is an amenable number.

66271189 is a deficient number, since it is larger than the sum of its proper divisors (1).

66271189 is an equidigital number, since it uses as much as digits as its factorization.

66271189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 66271189 is about 8140.7118239132. The cubic root of 66271189 is about 404.6767506544.

The spelling of 66271189 in words is "sixty-six million, two hundred seventy-one thousand, one hundred eighty-nine".