16566631172 has 96 divisors (see below), whose sum is σ = 37838449152. Its totient is φ = 6158923776.

The previous prime is 16566631129. The next prime is 16566631177. The reversal of 16566631172 is 27113666561.

It is not an unprimeable number, because it can be changed into a prime (16566631177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5091098 + ... + 5094350.

It is an arithmetic number, because the mean of its divisors is an integer number (394150512).

Almost surely, 2^16566631172 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 16566631172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18919224576).

16566631172 is an abundant number, since it is smaller than the sum of its proper divisors (21271817980).

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

16566631172 is a wasteful number, since it uses less digits than its factorization.

16566631172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4117 (or 4115 counting only the distinct ones).

The product of its digits is 272160, while the sum is 44.

The spelling of 16566631172 in words is "sixteen billion, five hundred sixty-six million, six hundred thirty-one thousand, one hundred seventy-two".