1543631664 has 40 divisors (see below), whose sum is σ = 4032532080. Its totient is φ = 508761088.

The previous prime is 1543631659. The next prime is 1543631681. The reversal of 1543631664 is 4661363451.

It is an unprimeable number.

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, 176397 + ... + 184940.

It is an arithmetic number, because the mean of its divisors is an integer number (100813302).

Almost surely, 2^1543631664 is an apocalyptic number.

It is an amenable number.

1543631664 is an abundant number, since it is smaller than the sum of its proper divisors (2488900416).

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

1543631664 is a wasteful number, since it uses less digits than its factorization.

1543631664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361437 (or 361431 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 1543631664 is about 39289.0781770201. The cubic root of 1543631664 is about 1155.7073967192.

The spelling of 1543631664 in words is "one billion, five hundred forty-three million, six hundred thirty-one thousand, six hundred sixty-four".