172108285645 has 4 divisors (see below), whose sum is σ = 206529942780. Its totient is φ = 137686628512.

The previous prime is 172108285589. The next prime is 172108285663. The reversal of 172108285645 is 546582801271.

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

It can be written as a sum of positive squares in 2 ways, for example, as 75254754276 + 96853531369 = 274326^2 + 311213^2 .

It is a cyclic number.

It is not a de Polignac number, because 172108285645 - 2¹⁷ = 172108154573 is a prime.

It is a super-3 number, since 3×172108285645³ (a number of 35 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17210828560 + ... + 17210828569.

It is an arithmetic number, because the mean of its divisors is an integer number (51632485695).

Almost surely, 2^172108285645 is an apocalyptic number.

It is an amenable number.

172108285645 is a deficient number, since it is larger than the sum of its proper divisors (34421657135).

172108285645 is an equidigital number, since it uses as much as digits as its factorization.

172108285645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34421657134.

The product of its (nonzero) digits is 1075200, while the sum is 49.

The spelling of 172108285645 in words is "one hundred seventy-two billion, one hundred eight million, two hundred eighty-five thousand, six hundred forty-five".