16661228752 has 120 divisors (see below), whose sum is σ = 38695856640. Its totient is φ = 6800682240.

The previous prime is 16661228737. The next prime is 16661228827. The reversal of 16661228752 is 25782216661.

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, 15585274 + ... + 15586342.

It is an arithmetic number, because the mean of its divisors is an integer number (322465472).

Almost surely, 2^16661228752 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 16661228752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19347928320).

16661228752 is an abundant number, since it is smaller than the sum of its proper divisors (22034627888).

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

16661228752 is a wasteful number, since it uses less digits than its factorization.

16661228752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249 (or 1176 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

It can be divided in two parts, 166612 and 28752, that added together give a square (195364 = 442²).

The spelling of 16661228752 in words is "sixteen billion, six hundred sixty-one million, two hundred twenty-eight thousand, seven hundred fifty-two".