129628510656871 has 4 divisors (see below), whose sum is σ = 132790181648544. Its totient is φ = 126466839665200.

The previous prime is 129628510656839. The next prime is 129628510656913. The reversal of 129628510656871 is 178656015826921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129628510656871 - 2⁵ = 129628510656839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129628510656797 and 129628510656806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129628510659871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1580835495775 + ... + 1580835495856.

It is an arithmetic number, because the mean of its divisors is an integer number (33197545412136).

Almost surely, 2^{129628510656871} is an apocalyptic number.

129628510656871 is a deficient number, since it is larger than the sum of its proper divisors (3161670991673).

129628510656871 is an equidigital number, since it uses as much as digits as its factorization.

129628510656871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3161670991672.

The product of its (nonzero) digits is 87091200, while the sum is 67.

The spelling of 129628510656871 in words is "one hundred twenty-nine trillion, six hundred twenty-eight billion, five hundred ten million, six hundred fifty-six thousand, eight hundred seventy-one".