129899738685 has 8 divisors (see below), whose sum is σ = 207839581920. Its totient is φ = 69279860624.

The previous prime is 129899738677. The next prime is 129899738687. The reversal of 129899738685 is 586837998921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129899738685 - 2³ = 129899738677 is a prime.

It is a super-2 number, since 2×129899738685² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129899738687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4329991275 + ... + 4329991304.

It is an arithmetic number, because the mean of its divisors is an integer number (25979947740).

Almost surely, 2^129899738685 is an apocalyptic number.

129899738685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129899738685 is a deficient number, since it is larger than the sum of its proper divisors (77939843235).

129899738685 is an equidigital number, since it uses as much as digits as its factorization.

129899738685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8659982587.

The product of its digits is 470292480, while the sum is 75.

The spelling of 129899738685 in words is "one hundred twenty-nine billion, eight hundred ninety-nine million, seven hundred thirty-eight thousand, six hundred eighty-five".