164263661 has 2 divisors, whose sum is σ = 164263662. Its totient is φ = 164263660.

The previous prime is 164263643. The next prime is 164263717. The reversal of 164263661 is 166362461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139948900 + 24314761 = 11830^2 + 4931^2 .

It is a cyclic number.

It is not a de Polignac number, because 164263661 - 2⁶ = 164263597 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164263601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82131830 + 82131831.

It is an arithmetic number, because the mean of its divisors is an integer number (82131831).

Almost surely, 2^164263661 is an apocalyptic number.

It is an amenable number.

164263661 is a deficient number, since it is larger than the sum of its proper divisors (1).

164263661 is an equidigital number, since it uses as much as digits as its factorization.

164263661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 35.

The square root of 164263661 is about 12816.5385732654. The cubic root of 164263661 is about 547.6635442010.

The spelling of 164263661 in words is "one hundred sixty-four million, two hundred sixty-three thousand, six hundred sixty-one".