164668213901 has 2 divisors, whose sum is σ = 164668213902. Its totient is φ = 164668213900.

The previous prime is 164668213873. The next prime is 164668213907. The reversal of 164668213901 is 109312866461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162723492100 + 1944721801 = 403390^2 + 44099^2 .

It is an emirp because it is prime and its reverse (109312866461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164668213901 - 2³⁰ = 163594472077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164668213907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82334106950 + 82334106951.

It is an arithmetic number, because the mean of its divisors is an integer number (82334106951).

Almost surely, 2^164668213901 is an apocalyptic number.

It is an amenable number.

164668213901 is a deficient number, since it is larger than the sum of its proper divisors (1).

164668213901 is an equidigital number, since it uses as much as digits as its factorization.

164668213901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 164668213901 in words is "one hundred sixty-four billion, six hundred sixty-eight million, two hundred thirteen thousand, nine hundred one".