16503199956 has 96 divisors (see below), whose sum is σ = 45941333760. Its totient is φ = 5104512000.

The previous prime is 16503199861. The next prime is 16503199991. The reversal of 16503199956 is 65999130561.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 67056 + ... + 193656.

It is an arithmetic number, because the mean of its divisors is an integer number (478555560).

Almost surely, 2^16503199956 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 16503199956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22970666880).

16503199956 is an abundant number, since it is smaller than the sum of its proper divisors (29438133804).

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

16503199956 is a wasteful number, since it uses less digits than its factorization.

16503199956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126702 (or 126694 counting only the distinct ones).

The product of its (nonzero) digits is 1968300, while the sum is 54.

The spelling of 16503199956 in words is "sixteen billion, five hundred three million, one hundred ninety-nine thousand, nine hundred fifty-six".