16556050566 has 80 divisors (see below), whose sum is σ = 40674585600. Its totient is φ = 4991667120.

The previous prime is 16556050561. The next prime is 16556050579. The reversal of 16556050566 is 66505065561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16556050561) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 331275 + ... + 377961.

It is an arithmetic number, because the mean of its divisors is an integer number (508432320).

Almost surely, 2^16556050566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16556050566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20337292800).

16556050566 is an abundant number, since it is smaller than the sum of its proper divisors (24118535034).

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

16556050566 is a wasteful number, since it uses less digits than its factorization.

16556050566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46911 (or 46902 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 16556050566 in words is "sixteen billion, five hundred fifty-six million, fifty thousand, five hundred sixty-six".