66676129 has 8 divisors (see below), whose sum is σ = 71921192. Its totient is φ = 61447680.

The previous prime is 66676121. The next prime is 66676139. The reversal of 66676129 is 92167666.

It can be written as a sum of positive squares in 4 ways, for example, as 6969600 + 59706529 = 2640^2 + 7727^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66676129 - 2³ = 66676121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66676121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4939 + ... + 12559.

It is an arithmetic number, because the mean of its divisors is an integer number (8990149).

Almost surely, 2^66676129 is an apocalyptic number.

It is an amenable number.

66676129 is a deficient number, since it is larger than the sum of its proper divisors (5245063).

66676129 is a wasteful number, since it uses less digits than its factorization.

66676129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8307.

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

The square root of 66676129 is about 8165.5452359288. The cubic root of 66676129 is about 405.4993160716.

The spelling of 66676129 in words is "sixty-six million, six hundred seventy-six thousand, one hundred twenty-nine".