164243633 has 2 divisors, whose sum is σ = 164243634. Its totient is φ = 164243632.

The previous prime is 164243623. The next prime is 164243689. The reversal of 164243633 is 336342461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116812864 + 47430769 = 10808^2 + 6887^2 .

It is a cyclic number.

It is not a de Polignac number, because 164243633 - 2²⁰ = 163195057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 164243633.

It is not a weakly prime, because it can be changed into another prime (164243623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82121816 + 82121817.

It is an arithmetic number, because the mean of its divisors is an integer number (82121817).

Almost surely, 2^164243633 is an apocalyptic number.

It is an amenable number.

164243633 is a deficient number, since it is larger than the sum of its proper divisors (1).

164243633 is an equidigital number, since it uses as much as digits as its factorization.

164243633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 32.

The square root of 164243633 is about 12815.7572152409. The cubic root of 164243633 is about 547.6412851669.

The spelling of 164243633 in words is "one hundred sixty-four million, two hundred forty-three thousand, six hundred thirty-three".