129666660 has 48 divisors (see below), whose sum is σ = 369230400. Its totient is φ = 33990784.

The previous prime is 129666643. The next prime is 129666679. The reversal of 129666660 is 66666921.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14775 + ... + 21854.

It is an arithmetic number, because the mean of its divisors is an integer number (7692300).

Almost surely, 2^129666660 is an apocalyptic number.

129666660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129666660 is an abundant number, since it is smaller than the sum of its proper divisors (239563740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129666660 is a wasteful number, since it uses less digits than its factorization.

129666660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36700 (or 36698 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 129666660 is about 11387.1269422976. The cubic root of 129666660 is about 506.1463485402.

The spelling of 129666660 in words is "one hundred twenty-nine million, six hundred sixty-six thousand, six hundred sixty".