16631590644 has 144 divisors (see below), whose sum is σ = 45854215680. Its totient is φ = 5063420160.

The previous prime is 16631590643. The next prime is 16631590667. The reversal of 16631590644 is 44609513661.

16631590644 is a `hidden beast` number, since 1 + 6 + 631 + 5 + 9 + 0 + 6 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 16631590644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16631590643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6211434 + ... + 6214110.

Almost surely, 2^16631590644 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 16631590644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22927107840).

16631590644 is an abundant number, since it is smaller than the sum of its proper divisors (29222625036).

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

16631590644 is a wasteful number, since it uses less digits than its factorization.

16631590644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030 (or 3025 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 16631590644 in words is "sixteen billion, six hundred thirty-one million, five hundred ninety thousand, six hundred forty-four".