16551309312 has 364 divisors, whose sum is σ = 51997647504. Its totient is φ = 5255331840.

The previous prime is 16551309239. The next prime is 16551309373. The reversal of 16551309312 is 21390315561.

It is a happy number.

16551309312 is a `hidden beast` number, since 1 + 6 + 551 + 3 + 0 + 93 + 12 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 68677512 + ... + 68677752.

Almost surely, 2^16551309312 is an apocalyptic number.

16551309312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16551309312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25998823752).

16551309312 is an abundant number, since it is smaller than the sum of its proper divisors (35446338192).

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

16551309312 is an frugal number, since it uses more digits than its factorization.

16551309312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The spelling of 16551309312 in words is "sixteen billion, five hundred fifty-one million, three hundred nine thousand, three hundred twelve".