172722911979 has 4 divisors (see below), whose sum is σ = 230297215976. Its totient is φ = 115148607984.

The previous prime is 172722911971. The next prime is 172722911993. The reversal of 172722911979 is 979119227271.

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

It is not a de Polignac number, because 172722911979 - 2³ = 172722911971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172722911971) 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, 28787151994 + ... + 28787151999.

It is an arithmetic number, because the mean of its divisors is an integer number (57574303994).

Almost surely, 2^172722911979 is an apocalyptic number.

172722911979 is a deficient number, since it is larger than the sum of its proper divisors (57574303997).

172722911979 is an equidigital number, since it uses as much as digits as its factorization.

172722911979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57574303996.

The product of its digits is 2000376, while the sum is 57.

The spelling of 172722911979 in words is "one hundred seventy-two billion, seven hundred twenty-two million, nine hundred eleven thousand, nine hundred seventy-nine".