172168645709 has 2 divisors, whose sum is σ = 172168645710. Its totient is φ = 172168645708.

The previous prime is 172168645703. The next prime is 172168645721. The reversal of 172168645709 is 907546861271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158049978025 + 14118667684 = 397555^2 + 118822^2 .

It is an emirp because it is prime and its reverse (907546861271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172168645709 is a prime.

It is a super-2 number, since 2×172168645709² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172168645703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86084322854 + 86084322855.

It is an arithmetic number, because the mean of its divisors is an integer number (86084322855).

Almost surely, 2^172168645709 is an apocalyptic number.

It is an amenable number.

172168645709 is a deficient number, since it is larger than the sum of its proper divisors (1).

172168645709 is an equidigital number, since it uses as much as digits as its factorization.

172168645709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5080320, while the sum is 56.

The spelling of 172168645709 in words is "one hundred seventy-two billion, one hundred sixty-eight million, six hundred forty-five thousand, seven hundred nine".