129717264850 has 24 divisors (see below), whose sum is σ = 243487646820. Its totient is φ = 51410877120.

The previous prime is 129717264739. The next prime is 129717264877. The reversal of 129717264850 is 58462717921.

It can be written as a sum of positive squares in 6 ways, for example, as 52234645401 + 77482619449 = 228549^2 + 278357^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11895217 + ... + 11906116.

Almost surely, 2^129717264850 is an apocalyptic number.

129717264850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129717264850 is a deficient number, since it is larger than the sum of its proper divisors (113770381970).

129717264850 is a wasteful number, since it uses less digits than its factorization.

129717264850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23801454 (or 23801449 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 129717264850 in words is "one hundred twenty-nine billion, seven hundred seventeen million, two hundred sixty-four thousand, eight hundred fifty".