16644820544 has 56 divisors (see below), whose sum is σ = 36047172000. Its totient is φ = 7562695680.

The previous prime is 16644820537. The next prime is 16644820559. The reversal of 16644820544 is 44502844661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 16644820495 and 16644820504.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3051932 + ... + 3057380.

It is an arithmetic number, because the mean of its divisors is an integer number (643699500).

Almost surely, 2^16644820544 is an apocalyptic number.

It is an amenable number.

16644820544 is an abundant number, since it is smaller than the sum of its proper divisors (19402351456).

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

16644820544 is a wasteful number, since it uses less digits than its factorization.

16644820544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9811 (or 9801 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 44.

The spelling of 16644820544 in words is "sixteen billion, six hundred forty-four million, eight hundred twenty thousand, five hundred forty-four".