129497993815 has 16 divisors (see below), whose sum is σ = 163796659200. Its totient is φ = 98013700512.

The previous prime is 129497993813. The next prime is 129497993837. The reversal of 129497993815 is 518399794921.

It is a cyclic number.

It is not a de Polignac number, because 129497993815 - 2¹ = 129497993813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129497993813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 846735 + ... + 987904.

It is an arithmetic number, because the mean of its divisors is an integer number (10237291200).

Almost surely, 2^129497993815 is an apocalyptic number.

129497993815 is a deficient number, since it is larger than the sum of its proper divisors (34298665385).

129497993815 is a wasteful number, since it uses less digits than its factorization.

129497993815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835406.

The product of its digits is 44089920, while the sum is 67.

The spelling of 129497993815 in words is "one hundred twenty-nine billion, four hundred ninety-seven million, nine hundred ninety-three thousand, eight hundred fifteen".