16418619644 has 96 divisors (see below), whose sum is σ = 36578304000. Its totient is φ = 6286230720.

The previous prime is 16418619599. The next prime is 16418619661. The reversal of 16418619644 is 44691681461.

It is a junction number, because it is equal to n+sod(n) for n = 16418619592 and 16418619601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 859307 + ... + 878205.

It is an arithmetic number, because the mean of its divisors is an integer number (381024000).

Almost surely, 2^16418619644 is an apocalyptic number.

16418619644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16418619644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18289152000).

16418619644 is an abundant number, since it is smaller than the sum of its proper divisors (20159684356).

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

16418619644 is a wasteful number, since it uses less digits than its factorization.

16418619644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19023 (or 19021 counting only the distinct ones).

The product of its digits is 995328, while the sum is 50.

The spelling of 16418619644 in words is "sixteen billion, four hundred eighteen million, six hundred nineteen thousand, six hundred forty-four".