172166723 has 2 divisors, whose sum is σ = 172166724. Its totient is φ = 172166722.

The previous prime is 172166717. The next prime is 172166741. The reversal of 172166723 is 327661271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172166723 - 2¹⁴ = 172150339 is a prime.

It is not a weakly prime, because it can be changed into another prime (172166783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86083361 + 86083362.

It is an arithmetic number, because the mean of its divisors is an integer number (86083362).

Almost surely, 2^172166723 is an apocalyptic number.

172166723 is a deficient number, since it is larger than the sum of its proper divisors (1).

172166723 is an equidigital number, since it uses as much as digits as its factorization.

172166723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 35.

The square root of 172166723 is about 13121.2317638246. The cubic root of 172166723 is about 556.3094078199.

The spelling of 172166723 in words is "one hundred seventy-two million, one hundred sixty-six thousand, seven hundred twenty-three".