172120146805 has 32 divisors (see below), whose sum is σ = 220876185600. Its totient is φ = 128376021312.

The previous prime is 172120146683. The next prime is 172120146829. The reversal of 172120146805 is 508641021271.

It is a cyclic number.

It is not a de Polignac number, because 172120146805 - 2⁹ = 172120146293 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6753276 + ... + 6778714.

It is an arithmetic number, because the mean of its divisors is an integer number (6902380800).

Almost surely, 2^172120146805 is an apocalyptic number.

It is an amenable number.

172120146805 is a deficient number, since it is larger than the sum of its proper divisors (48756038795).

172120146805 is a wasteful number, since it uses less digits than its factorization.

172120146805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26593.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 172120146805 in words is "one hundred seventy-two billion, one hundred twenty million, one hundred forty-six thousand, eight hundred five".