1983664549 has 8 divisors (see below), whose sum is σ = 2086290432. Its totient is φ = 1883453520.

The previous prime is 1983664517. The next prime is 1983664561. The reversal of 1983664549 is 9454663891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1983664549 - 2⁵ = 1983664517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1983664549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1983664349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 602029 + ... + 605314.

It is an arithmetic number, because the mean of its divisors is an integer number (260786304).

Almost surely, 2^1983664549 is an apocalyptic number.

It is an amenable number.

1983664549 is a deficient number, since it is larger than the sum of its proper divisors (102625883).

1983664549 is a wasteful number, since it uses less digits than its factorization.

1983664549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207427.

The product of its digits is 5598720, while the sum is 55.

The square root of 1983664549 is about 44538.3491948231. The cubic root of 1983664549 is about 1256.4814384648.

The spelling of 1983664549 in words is "one billion, nine hundred eighty-three million, six hundred sixty-four thousand, five hundred forty-nine".