66671117 has 2 divisors, whose sum is σ = 66671118. Its totient is φ = 66671116.

The previous prime is 66671083. The next prime is 66671131. The reversal of 66671117 is 71117666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33884041 + 32787076 = 5821^2 + 5726^2 .

It is a cyclic number.

It is not a de Polignac number, because 66671117 - 2⁶ = 66671053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66671167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33335558 + 33335559.

It is an arithmetic number, because the mean of its divisors is an integer number (33335559).

Almost surely, 2^66671117 is an apocalyptic number.

It is an amenable number.

66671117 is a deficient number, since it is larger than the sum of its proper divisors (1).

66671117 is an equidigital number, since it uses as much as digits as its factorization.

66671117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 35.

The square root of 66671117 is about 8165.2383308756. The cubic root of 66671117 is about 405.4891554462.

The spelling of 66671117 in words is "sixty-six million, six hundred seventy-one thousand, one hundred seventeen".