172665061 has 2 divisors, whose sum is σ = 172665062. Its totient is φ = 172665060.

The previous prime is 172665037. The next prime is 172665067. The reversal of 172665061 is 160566271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170433025 + 2232036 = 13055^2 + 1494^2 .

It is an emirp because it is prime and its reverse (160566271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172665061 - 2⁵ = 172665029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172665067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86332530 + 86332531.

It is an arithmetic number, because the mean of its divisors is an integer number (86332531).

Almost surely, 2^172665061 is an apocalyptic number.

It is an amenable number.

172665061 is a deficient number, since it is larger than the sum of its proper divisors (1).

172665061 is an equidigital number, since it uses as much as digits as its factorization.

172665061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 172665061 is about 13140.2077989657. The cubic root of 172665061 is about 556.8456381678.

The spelling of 172665061 in words is "one hundred seventy-two million, six hundred sixty-five thousand, sixty-one".