129656623697 has 8 divisors (see below), whose sum is σ = 130091275392. Its totient is φ = 129222086400.

The previous prime is 129656623643. The next prime is 129656623699. The reversal of 129656623697 is 796326656921.

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 129656623697 - 2¹⁴ = 129656607313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129656623699) 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, 2663228 + ... + 2711474.

It is an arithmetic number, because the mean of its divisors is an integer number (16261409424).

Almost surely, 2^129656623697 is an apocalyptic number.

It is an amenable number.

129656623697 is a deficient number, since it is larger than the sum of its proper divisors (434651695).

129656623697 is an equidigital number, since it uses as much as digits as its factorization.

129656623697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57199.

The product of its digits is 44089920, while the sum is 62.

The spelling of 129656623697 in words is "one hundred twenty-nine billion, six hundred fifty-six million, six hundred twenty-three thousand, six hundred ninety-seven".