66604129 has 4 divisors (see below), whose sum is σ = 67352580. Its totient is φ = 65855680.

The previous prime is 66604127. The next prime is 66604163. The reversal of 66604129 is 92140666.

66604129 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 38725729 + 27878400 = 6223^2 + 5280^2 .

It is a cyclic number.

It is not a de Polignac number, because 66604129 - 2¹ = 66604127 is a prime.

It is a super-2 number, since 2×66604129² = 8872219999697282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66604094 and 66604103.

It is not an unprimeable number, because it can be changed into a prime (66604127) 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, 374092 + ... + 374269.

It is an arithmetic number, because the mean of its divisors is an integer number (16838145).

Almost surely, 2^66604129 is an apocalyptic number.

It is an amenable number.

66604129 is a deficient number, since it is larger than the sum of its proper divisors (748451).

66604129 is an equidigital number, since it uses as much as digits as its factorization.

66604129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748450.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 66604129 is about 8161.1352764183. The cubic root of 66604129 is about 405.3533044651.

The spelling of 66604129 in words is "sixty-six million, six hundred four thousand, one hundred twenty-nine".