66929117 has 2 divisors, whose sum is σ = 66929118. Its totient is φ = 66929116.

The previous prime is 66929099. The next prime is 66929123. The reversal of 66929117 is 71192966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61293241 + 5635876 = 7829^2 + 2374^2 .

It is a cyclic number.

It is not a de Polignac number, because 66929117 - 2⁶ = 66929053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66929197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33464558 + 33464559.

It is an arithmetic number, because the mean of its divisors is an integer number (33464559).

Almost surely, 2^66929117 is an apocalyptic number.

It is an amenable number.

66929117 is a deficient number, since it is larger than the sum of its proper divisors (1).

66929117 is an equidigital number, since it uses as much as digits as its factorization.

66929117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 66929117 is about 8181.0217577024. The cubic root of 66929117 is about 406.0115283031.

The spelling of 66929117 in words is "sixty-six million, nine hundred twenty-nine thousand, one hundred seventeen".