172129208963 has 4 divisors (see below), whose sum is σ = 172798972680. Its totient is φ = 171459445248.

The previous prime is 172129208939. The next prime is 172129209001. The reversal of 172129208963 is 369802921271.

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 172129208963 - 2⁶ = 172129208899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172129208263) 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, 334881473 + ... + 334881986.

It is an arithmetic number, because the mean of its divisors is an integer number (43199743170).

Almost surely, 2^172129208963 is an apocalyptic number.

172129208963 is a deficient number, since it is larger than the sum of its proper divisors (669763717).

172129208963 is an equidigital number, since it uses as much as digits as its factorization.

172129208963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669763716.

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 172129208963 in words is "one hundred seventy-two billion, one hundred twenty-nine million, two hundred eight thousand, nine hundred sixty-three".