1661384179584 has 256 divisors, whose sum is σ = 5194557345600. Its totient is φ = 520944353280.

The previous prime is 1661384179583. The next prime is 1661384179619. The reversal of 1661384179584 is 4859714831661.

1661384179584 is a `hidden beast` number, since 1 + 6 + 6 + 1 + 3 + 8 + 41 + 7 + 9 + 584 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661384179583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131421904 + ... + 131434544.

Almost surely, 2^{1661384179584} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661384179584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2597278672800).

1661384179584 is an abundant number, since it is smaller than the sum of its proper divisors (3533173166016).

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

1661384179584 is a wasteful number, since it uses less digits than its factorization.

1661384179584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14918 (or 14900 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The spelling of 1661384179584 in words is "one trillion, six hundred sixty-one billion, three hundred eighty-four million, one hundred seventy-nine thousand, five hundred eighty-four".