16551110556 has 36 divisors (see below), whose sum is σ = 41841493512. Its totient is φ = 5516514144.

The previous prime is 16551110551. The next prime is 16551110561. The reversal of 16551110556 is 65501115561.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16551110551) and next prime (16551110561).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 16551110556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16551110551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 633651 + ... + 659253.

Almost surely, 2^16551110556 is an apocalyptic number.

It is an amenable number.

16551110556 is an abundant number, since it is smaller than the sum of its proper divisors (25290382956).

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

16551110556 is a wasteful number, since it uses less digits than its factorization.

16551110556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43570 (or 43565 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 16551110556 in words is "sixteen billion, five hundred fifty-one million, one hundred ten thousand, five hundred fifty-six".