16781399752806 has 48 divisors (see below), whose sum is σ = 40606843861584. Its totient is φ = 5163507614304.

The previous prime is 16781399752801. The next prime is 16781399752813. The reversal of 16781399752806 is 60825799318761.

16781399752806 is a `hidden beast` number, since 1 + 6 + 7 + 8 + 1 + 3 + 9 + 97 + 528 + 0 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16781399752801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1328056341 + ... + 1328068976.

It is an arithmetic number, because the mean of its divisors is an integer number (845975913783).

Almost surely, 2^{16781399752806} is an apocalyptic number.

16781399752806 is an abundant number, since it is smaller than the sum of its proper divisors (23825444108778).

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

16781399752806 is a wasteful number, since it uses less digits than its factorization.

16781399752806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656125347 (or 2656125335 counting only the distinct ones).

The product of its (nonzero) digits is 274337280, while the sum is 72.

The spelling of 16781399752806 in words is "sixteen trillion, seven hundred eighty-one billion, three hundred ninety-nine million, seven hundred fifty-two thousand, eight hundred six".