129609433687 has 8 divisors (see below), whose sum is σ = 135253261440. Its totient is φ = 123966325560.

The previous prime is 129609433669. The next prime is 129609433721. The reversal of 129609433687 is 786334906921.

It is a happy number.

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 129609433687 - 2¹¹ = 129609431639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129609431687) 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, 205764 + ... + 549142.

It is an arithmetic number, because the mean of its divisors is an integer number (16906657680).

Almost surely, 2^129609433687 is an apocalyptic number.

129609433687 is a deficient number, since it is larger than the sum of its proper divisors (5643827753).

129609433687 is a wasteful number, since it uses less digits than its factorization.

129609433687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359813.

The product of its (nonzero) digits is 11757312, while the sum is 58.

The spelling of 129609433687 in words is "one hundred twenty-nine billion, six hundred nine million, four hundred thirty-three thousand, six hundred eighty-seven".