172685266489 has 2 divisors, whose sum is σ = 172685266490. Its totient is φ = 172685266488.

The previous prime is 172685266483. The next prime is 172685266493. The reversal of 172685266489 is 984662586271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159833643264 + 12851623225 = 399792^2 + 113365^2 .

It is a cyclic number.

It is not a de Polignac number, because 172685266489 - 2¹⁹ = 172684742201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172685266489.

It is not a weakly prime, because it can be changed into another prime (172685266483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86342633244 + 86342633245.

It is an arithmetic number, because the mean of its divisors is an integer number (86342633245).

Almost surely, 2^172685266489 is an apocalyptic number.

It is an amenable number.

172685266489 is a deficient number, since it is larger than the sum of its proper divisors (1).

172685266489 is an equidigital number, since it uses as much as digits as its factorization.

172685266489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69672960, while the sum is 64.

The spelling of 172685266489 in words is "one hundred seventy-two billion, six hundred eighty-five million, two hundred sixty-six thousand, four hundred eighty-nine".