16181643544 has 32 divisors (see below), whose sum is σ = 33191078400. Its totient is φ = 7334789920.

The previous prime is 16181643539. The next prime is 16181643637. The reversal of 16181643544 is 44534618161.

It is a self number, because there is not a number n which added to its sum of digits gives 16181643544.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224512 + ... + 287695.

It is an arithmetic number, because the mean of its divisors is an integer number (1037221200).

Almost surely, 2^16181643544 is an apocalyptic number.

It is an amenable number.

16181643544 is an abundant number, since it is smaller than the sum of its proper divisors (17009434856).

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

16181643544 is a wasteful number, since it uses less digits than its factorization.

16181643544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512583 (or 512579 counting only the distinct ones).

The product of its digits is 276480, while the sum is 43.

The spelling of 16181643544 in words is "sixteen billion, one hundred eighty-one million, six hundred forty-three thousand, five hundred forty-four".