129243766816 has 48 divisors (see below), whose sum is σ = 255467774016. Its totient is φ = 64363591936.

The previous prime is 129243766759. The next prime is 129243766831. The reversal of 129243766816 is 618667342921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8316045 + ... + 8331571.

It is an arithmetic number, because the mean of its divisors is an integer number (5322245292).

Almost surely, 2^129243766816 is an apocalyptic number.

129243766816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129243766816 is a deficient number, since it is larger than the sum of its proper divisors (126224007200).

129243766816 is a wasteful number, since it uses less digits than its factorization.

129243766816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16561 (or 16553 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 55.

The spelling of 129243766816 in words is "one hundred twenty-nine billion, two hundred forty-three million, seven hundred sixty-six thousand, eight hundred sixteen".