1659445644 has 48 divisors (see below), whose sum is σ = 3996913536. Its totient is φ = 535516800.

The previous prime is 1659445609. The next prime is 1659445649. The reversal of 1659445644 is 4465449561.

It is a junction number, because it is equal to n+sod(n) for n = 1659445593 and 1659445602.

It is not an unprimeable number, because it can be changed into a prime (1659445649) 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 15 ways as a sum of consecutive naturals, for example, 51579 + ... + 77325.

It is an arithmetic number, because the mean of its divisors is an integer number (83269032).

Almost surely, 2^1659445644 is an apocalyptic number.

It is an amenable number.

1659445644 is an abundant number, since it is smaller than the sum of its proper divisors (2337467892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1659445644 is a wasteful number, since it uses less digits than its factorization.

1659445644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25926 (or 25924 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 48.

The square root of 1659445644 is about 40736.2939404163. The cubic root of 1659445644 is about 1183.9163288130.

The spelling of 1659445644 in words is "one billion, six hundred fifty-nine million, four hundred forty-five thousand, six hundred forty-four".