16603631616 has 312 divisors, whose sum is σ = 52465648480. Its totient is φ = 4638965760.

The previous prime is 16603631591. The next prime is 16603631623. The reversal of 16603631616 is 61613630661.

It is a tau number, because it is divible by the number of its divisors (312).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19328595 + ... + 19329453.

Almost surely, 2^16603631616 is an apocalyptic number.

16603631616 is a gapful number since it is divisible by the number (16) 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 16603631616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26232824240).

16603631616 is an abundant number, since it is smaller than the sum of its proper divisors (35862016864).

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

16603631616 is a wasteful number, since it uses less digits than its factorization.

16603631616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 888 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 39.

The spelling of 16603631616 in words is "sixteen billion, six hundred three million, six hundred thirty-one thousand, six hundred sixteen".