129285566920 has 16 divisors (see below), whose sum is σ = 290892525660. Its totient is φ = 51714226752.

The previous prime is 129285566911. The next prime is 129285566953. The reversal of 129285566920 is 29665582921.

It can be written as a sum of positive squares in 2 ways, for example, as 128569576356 + 715990564 = 358566^2 + 26758^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1616069547 + ... + 1616069626.

Almost surely, 2^129285566920 is an apocalyptic number.

129285566920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129285566920 is an abundant number, since it is smaller than the sum of its proper divisors (161606958740).

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

129285566920 is a wasteful number, since it uses less digits than its factorization.

129285566920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3232139184 (or 3232139180 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 129285566920 in words is "one hundred twenty-nine billion, two hundred eighty-five million, five hundred sixty-six thousand, nine hundred twenty".