66655129 has 2 divisors, whose sum is σ = 66655130. Its totient is φ = 66655128.

The previous prime is 66655123. The next prime is 66655133. The reversal of 66655129 is 92155666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66389904 + 265225 = 8148^2 + 515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66655129 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66655091 and 66655100.

It is not a weakly prime, because it can be changed into another prime (66655123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33327564 + 33327565.

It is an arithmetic number, because the mean of its divisors is an integer number (33327565).

Almost surely, 2^66655129 is an apocalyptic number.

It is an amenable number.

66655129 is a deficient number, since it is larger than the sum of its proper divisors (1).

66655129 is an equidigital number, since it uses as much as digits as its factorization.

66655129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 40.

The square root of 66655129 is about 8164.2592438016. The cubic root of 66655129 is about 405.4567402156.

The spelling of 66655129 in words is "sixty-six million, six hundred fifty-five thousand, one hundred twenty-nine".