164644653 has 4 divisors (see below), whose sum is σ = 219526208. Its totient is φ = 109763100.

The previous prime is 164644631. The next prime is 164644657. The reversal of 164644653 is 356446461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 164644653 - 2⁵ = 164644621 is a prime.

It is a super-2 number, since 2×164644653² = 54215723522980818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164644657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27440773 + ... + 27440778.

It is an arithmetic number, because the mean of its divisors is an integer number (54881552).

Almost surely, 2^164644653 is an apocalyptic number.

It is an amenable number.

164644653 is a deficient number, since it is larger than the sum of its proper divisors (54881555).

164644653 is an equidigital number, since it uses as much as digits as its factorization.

164644653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54881554.

The product of its digits is 207360, while the sum is 39.

The square root of 164644653 is about 12831.3932602816. The cubic root of 164644653 is about 548.0866329460.

The spelling of 164644653 in words is "one hundred sixty-four million, six hundred forty-four thousand, six hundred fifty-three".