1644360164 has 24 divisors (see below), whose sum is σ = 2952186048. Its totient is φ = 801131040.

The previous prime is 1644360143. The next prime is 1644360169. The reversal of 1644360164 is 4610634461.

It is a happy number.

It is a super-3 number, since 3×1644360164³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1644360169) 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 7 ways as a sum of consecutive naturals, for example, 5384 + ... + 57599.

It is an arithmetic number, because the mean of its divisors is an integer number (123007752).

Almost surely, 2^1644360164 is an apocalyptic number.

It is an amenable number.

1644360164 is a deficient number, since it is larger than the sum of its proper divisors (1307825884).

1644360164 is a wasteful number, since it uses less digits than its factorization.

1644360164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63155 (or 63153 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 1644360164 is about 40550.7110171943. The cubic root of 1644360164 is about 1180.3178699324.

The spelling of 1644360164 in words is "one billion, six hundred forty-four million, three hundred sixty thousand, one hundred sixty-four".