660440686129 has 8 divisors (see below), whose sum is σ = 754948263168. Its totient is φ = 565972836000.

The previous prime is 660440686111. The next prime is 660440686141. The reversal of 660440686129 is 921686044066.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660440686129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660440686729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9896092 + ... + 9962605.

It is an arithmetic number, because the mean of its divisors is an integer number (94368532896).

Almost surely, 2^660440686129 is an apocalyptic number.

It is an amenable number.

660440686129 is a deficient number, since it is larger than the sum of its proper divisors (94507577039).

660440686129 is a wasteful number, since it uses less digits than its factorization.

660440686129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19863455.

The product of its (nonzero) digits is 2985984, while the sum is 52.

The spelling of 660440686129 in words is "six hundred sixty billion, four hundred forty million, six hundred eighty-six thousand, one hundred twenty-nine".