66709429 has 2 divisors, whose sum is σ = 66709430. Its totient is φ = 66709428.

The previous prime is 66709393. The next prime is 66709439. The reversal of 66709429 is 92490766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64368529 + 2340900 = 8023^2 + 1530^2 .

It is a cyclic number.

It is not a de Polignac number, because 66709429 - 2⁷ = 66709301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66709439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33354714 + 33354715.

It is an arithmetic number, because the mean of its divisors is an integer number (33354715).

Almost surely, 2^66709429 is an apocalyptic number.

It is an amenable number.

66709429 is a deficient number, since it is larger than the sum of its proper divisors (1).

66709429 is an equidigital number, since it uses as much as digits as its factorization.

66709429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 66709429 is about 8167.5840369108. The cubic root of 66709429 is about 405.5668108912.

The spelling of 66709429 in words is "sixty-six million, seven hundred nine thousand, four hundred twenty-nine".