1661584684 has 12 divisors (see below), whose sum is σ = 2924019000. Its totient is φ = 826150688.

The previous prime is 1661584681. The next prime is 1661584693. The reversal of 1661584684 is 4864851661.

It is not an unprimeable number, because it can be changed into a prime (1661584681) 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 3 ways as a sum of consecutive naturals, for example, 1159609 + ... + 1161040.

It is an arithmetic number, because the mean of its divisors is an integer number (243668250).

Almost surely, 2^1661584684 is an apocalyptic number.

It is an amenable number.

1661584684 is a deficient number, since it is larger than the sum of its proper divisors (1262434316).

1661584684 is a wasteful number, since it uses less digits than its factorization.

1661584684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320832 (or 2320830 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 49.

The square root of 1661584684 is about 40762.5402054386. The cubic root of 1661584684 is about 1184.4248032459.

The spelling of 1661584684 in words is "one billion, six hundred sixty-one million, five hundred eighty-four thousand, six hundred eighty-four".