16565455368 has 768 divisors, whose sum is σ = 63203328000. Its totient is φ = 3900441600.

The previous prime is 16565455351. The next prime is 16565455373. The reversal of 16565455368 is 86355456561.

16565455368 is a `hidden beast` number, since 1 + 6 + 5 + 65 + 45 + 536 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (12960000) is a multiple of the sum of its prime divisors (162).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 186128668 + ... + 186128756.

It is an arithmetic number, because the mean of its divisors is an integer number (82296000).

Almost surely, 2^16565455368 is an apocalyptic number.

16565455368 is a gapful number since it is divisible by the number (18) 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 16565455368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31601664000).

16565455368 is an abundant number, since it is smaller than the sum of its proper divisors (46637872632).

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

16565455368 is a wasteful number, since it uses less digits than its factorization.

16565455368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 162 counting only the distinct ones).

The product of its digits is 12960000, while the sum is 54.

The spelling of 16565455368 in words is "sixteen billion, five hundred sixty-five million, four hundred fifty-five thousand, three hundred sixty-eight".