129516666321 has 16 divisors (see below), whose sum is σ = 202172358528. Its totient is φ = 72204412800.

The previous prime is 129516666313. The next prime is 129516666337. The reversal of 129516666321 is 123666615921.

It is not a de Polignac number, because 129516666321 - 2³ = 129516666313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129516666311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75212070 + ... + 75213791.

It is an arithmetic number, because the mean of its divisors is an integer number (12635772408).

Almost surely, 2^129516666321 is an apocalyptic number.

It is an amenable number.

129516666321 is a deficient number, since it is larger than the sum of its proper divisors (72655692207).

129516666321 is a wasteful number, since it uses less digits than its factorization.

129516666321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150425912.

The product of its digits is 699840, while the sum is 48.

The spelling of 129516666321 in words is "one hundred twenty-nine billion, five hundred sixteen million, six hundred sixty-six thousand, three hundred twenty-one".