164663321 has 2 divisors, whose sum is σ = 164663322. Its totient is φ = 164663320.

The previous prime is 164663281. The next prime is 164663341. The reversal of 164663321 is 123366461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151782400 + 12880921 = 12320^2 + 3589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164663321 is a prime.

It is a super-2 number, since 2×164663321² = 54228018565498082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (164663341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82331660 + 82331661.

It is an arithmetic number, because the mean of its divisors is an integer number (82331661).

Almost surely, 2^164663321 is an apocalyptic number.

It is an amenable number.

164663321 is a deficient number, since it is larger than the sum of its proper divisors (1).

164663321 is an equidigital number, since it uses as much as digits as its factorization.

164663321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

The square root of 164663321 is about 12832.1206743079. The cubic root of 164663321 is about 548.1073468379.

The spelling of 164663321 in words is "one hundred sixty-four million, six hundred sixty-three thousand, three hundred twenty-one".