66398129 has 8 divisors (see below), whose sum is σ = 76001088. Its totient is φ = 56824560.

The previous prime is 66398117. The next prime is 66398131. The reversal of 66398129 is 92189366.

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 66398129 - 2¹⁶ = 66332593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66398129.

It is not an unprimeable number, because it can be changed into a prime (66398329) 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, 2267 + ... + 11744.

It is an arithmetic number, because the mean of its divisors is an integer number (9500136).

Almost surely, 2^66398129 is an apocalyptic number.

It is an amenable number.

66398129 is a deficient number, since it is larger than the sum of its proper divisors (9602959).

66398129 is a wasteful number, since it uses less digits than its factorization.

66398129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14695.

The product of its digits is 139968, while the sum is 44.

The square root of 66398129 is about 8148.5047094544. The cubic root of 66398129 is about 404.9349669495.

The spelling of 66398129 in words is "sixty-six million, three hundred ninety-eight thousand, one hundred twenty-nine".