164205649 has 2 divisors, whose sum is σ = 164205650. Its totient is φ = 164205648.

The previous prime is 164205647. The next prime is 164205653. The reversal of 164205649 is 946502461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139405249 + 24800400 = 11807^2 + 4980^2 .

It is a cyclic number.

It is not a de Polignac number, because 164205649 - 2¹ = 164205647 is a prime.

It is a super-2 number, since 2×164205649² = 53926990327022402, which contains 22 as substring.

Together with 164205647, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (164205647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82102824 + 82102825.

It is an arithmetic number, because the mean of its divisors is an integer number (82102825).

Almost surely, 2^164205649 is an apocalyptic number.

It is an amenable number.

164205649 is a deficient number, since it is larger than the sum of its proper divisors (1).

164205649 is an equidigital number, since it uses as much as digits as its factorization.

164205649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 164205649 is about 12814.2752038498. The cubic root of 164205649 is about 547.5990649400.

The spelling of 164205649 in words is "one hundred sixty-four million, two hundred five thousand, six hundred forty-nine".