172720454318 has 16 divisors (see below), whose sum is σ = 262130904000. Its totient is φ = 85344517632.

The previous prime is 172720454299. The next prime is 172720454327. The reversal of 172720454318 is 813454027271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79403 + ... + 593081.

It is an arithmetic number, because the mean of its divisors is an integer number (16383181500).

Almost surely, 2^172720454318 is an apocalyptic number.

172720454318 is a deficient number, since it is larger than the sum of its proper divisors (89410449682).

172720454318 is a wasteful number, since it uses less digits than its factorization.

172720454318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515659.

The product of its (nonzero) digits is 376320, while the sum is 44.

The spelling of 172720454318 in words is "one hundred seventy-two billion, seven hundred twenty million, four hundred fifty-four thousand, three hundred eighteen".