172327285661 has 2 divisors, whose sum is σ = 172327285662. Its totient is φ = 172327285660.

The previous prime is 172327285633. The next prime is 172327285667. The reversal of 172327285661 is 166582723271.

172327285661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159036654436 + 13290631225 = 398794^2 + 115285^2 .

It is a cyclic number.

It is not a de Polignac number, because 172327285661 - 2¹⁴ = 172327269277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172327285667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86163642830 + 86163642831.

It is an arithmetic number, because the mean of its divisors is an integer number (86163642831).

Almost surely, 2^172327285661 is an apocalyptic number.

It is an amenable number.

172327285661 is a deficient number, since it is larger than the sum of its proper divisors (1).

172327285661 is an equidigital number, since it uses as much as digits as its factorization.

172327285661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 50.

The spelling of 172327285661 in words is "one hundred seventy-two billion, three hundred twenty-seven million, two hundred eighty-five thousand, six hundred sixty-one".