172852947661 has 2 divisors, whose sum is σ = 172852947662. Its totient is φ = 172852947660.

The previous prime is 172852947649. The next prime is 172852947821. The reversal of 172852947661 is 166749258271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164353214025 + 8499733636 = 405405^2 + 92194^2 .

It is an emirp because it is prime and its reverse (166749258271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172852947661 - 2⁹ = 172852947149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172852947596 and 172852947605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172852947961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86426473830 + 86426473831.

It is an arithmetic number, because the mean of its divisors is an integer number (86426473831).

Almost surely, 2^172852947661 is an apocalyptic number.

It is an amenable number.

172852947661 is a deficient number, since it is larger than the sum of its proper divisors (1).

172852947661 is an equidigital number, since it uses as much as digits as its factorization.

172852947661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10160640, while the sum is 58.

The spelling of 172852947661 in words is "one hundred seventy-two billion, eight hundred fifty-two million, nine hundred forty-seven thousand, six hundred sixty-one".