1644466456 has 16 divisors (see below), whose sum is σ = 3148979040. Its totient is φ = 804738720.

The previous prime is 1644466441. The next prime is 1644466459. The reversal of 1644466456 is 6546644461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644466459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2186415 + ... + 2187166.

It is an arithmetic number, because the mean of its divisors is an integer number (196811190).

Almost surely, 2^1644466456 is an apocalyptic number.

It is an amenable number.

1644466456 is a deficient number, since it is larger than the sum of its proper divisors (1504512584).

1644466456 is a wasteful number, since it uses less digits than its factorization.

1644466456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4373634 (or 4373630 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 46.

The square root of 1644466456 is about 40552.0216018881. The cubic root of 1644466456 is about 1180.3433014339.

The spelling of 1644466456 in words is "one billion, six hundred forty-four million, four hundred sixty-six thousand, four hundred fifty-six".