164433606509 has 2 divisors, whose sum is σ = 164433606510. Its totient is φ = 164433606508.

The previous prime is 164433606401. The next prime is 164433606521. The reversal of 164433606509 is 905606334461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162830004484 + 1603602025 = 403522^2 + 40045^2 .

It is an emirp because it is prime and its reverse (905606334461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164433606509 is a prime.

It is a super-3 number, since 3×164433606509³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164433606599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82216803254 + 82216803255.

It is an arithmetic number, because the mean of its divisors is an integer number (82216803255).

Almost surely, 2^164433606509 is an apocalyptic number.

It is an amenable number.

164433606509 is a deficient number, since it is larger than the sum of its proper divisors (1).

164433606509 is an equidigital number, since it uses as much as digits as its factorization.

164433606509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 47.

The spelling of 164433606509 in words is "one hundred sixty-four billion, four hundred thirty-three million, six hundred six thousand, five hundred nine".