66718129 has 2 divisors, whose sum is σ = 66718130. Its totient is φ = 66718128.

The previous prime is 66718121. The next prime is 66718153. The reversal of 66718129 is 92181766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39438400 + 27279729 = 6280^2 + 5223^2 .

It is a cyclic number.

It is not a de Polignac number, because 66718129 - 2³ = 66718121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66718091 and 66718100.

It is not a weakly prime, because it can be changed into another prime (66718121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33359064 + 33359065.

It is an arithmetic number, because the mean of its divisors is an integer number (33359065).

Almost surely, 2^66718129 is an apocalyptic number.

It is an amenable number.

66718129 is a deficient number, since it is larger than the sum of its proper divisors (1).

66718129 is an equidigital number, since it uses as much as digits as its factorization.

66718129 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 66718129 is about 8168.1166127817. The cubic root of 66718129 is about 405.5844409720.

The spelling of 66718129 in words is "sixty-six million, seven hundred eighteen thousand, one hundred twenty-nine".