66712129 has 8 divisors (see below), whose sum is σ = 74325888. Its totient is φ = 59356560.

The previous prime is 66712127. The next prime is 66712133. The reversal of 66712129 is 92121766.

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 66712129 - 2¹ = 66712127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66712094 and 66712103.

It is not an unprimeable number, because it can be changed into a prime (66712123) 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, 64002 + ... + 65035.

It is an arithmetic number, because the mean of its divisors is an integer number (9290736).

Almost surely, 2^66712129 is an apocalyptic number.

It is an amenable number.

66712129 is a deficient number, since it is larger than the sum of its proper divisors (7613759).

66712129 is a wasteful number, since it uses less digits than its factorization.

66712129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129095.

The product of its digits is 9072, while the sum is 34.

The square root of 66712129 is about 8167.7493227939. The cubic root of 66712129 is about 405.5722824596.

The spelling of 66712129 in words is "sixty-six million, seven hundred twelve thousand, one hundred twenty-nine".