172668551911 has 4 divisors (see below), whose sum is σ = 172672687800. Its totient is φ = 172664416024.

The previous prime is 172668551893. The next prime is 172668551963. The reversal of 172668551911 is 119155866271.

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 172668551911 - 2⁵ = 172668551879 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 (172668552911) 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, 2004676 + ... + 2089033.

It is an arithmetic number, because the mean of its divisors is an integer number (43168171950).

Almost surely, 2^172668551911 is an apocalyptic number.

172668551911 is a deficient number, since it is larger than the sum of its proper divisors (4135889).

172668551911 is an equidigital number, since it uses as much as digits as its factorization.

172668551911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4135888.

The product of its digits is 907200, while the sum is 52.

The spelling of 172668551911 in words is "one hundred seventy-two billion, six hundred sixty-eight million, five hundred fifty-one thousand, nine hundred eleven".