66560129 has 4 divisors (see below), whose sum is σ = 66576900. Its totient is φ = 66543360.

The previous prime is 66560119. The next prime is 66560141. The reversal of 66560129 is 92106566.

It is a happy number.

66560129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53993104 + 12567025 = 7348^2 + 3545^2 .

It is a cyclic number.

It is not a de Polignac number, because 66560129 - 2²⁴ = 49782913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66560119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1289 + ... + 11609.

It is an arithmetic number, because the mean of its divisors is an integer number (16644225).

Almost surely, 2^66560129 is an apocalyptic number.

It is an amenable number.

66560129 is a deficient number, since it is larger than the sum of its proper divisors (16771).

66560129 is a wasteful number, since it uses less digits than its factorization.

66560129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16770.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 66560129 is about 8158.4391276763. The cubic root of 66560129 is about 405.2640233419.

The spelling of 66560129 in words is "sixty-six million, five hundred sixty thousand, one hundred twenty-nine".