16684120865 has 16 divisors (see below), whose sum is σ = 20565163008. Its totient is φ = 12987769536.

The previous prime is 16684120847. The next prime is 16684120879. The reversal of 16684120865 is 56802148661.

It is a cyclic number.

It is not a de Polignac number, because 16684120865 - 2⁶ = 16684120801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 164537 + ... + 245846.

It is an arithmetic number, because the mean of its divisors is an integer number (1285322688).

Almost surely, 2^16684120865 is an apocalyptic number.

It is an amenable number.

16684120865 is a deficient number, since it is larger than the sum of its proper divisors (3881042143).

16684120865 is a wasteful number, since it uses less digits than its factorization.

16684120865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410608.

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 16684120865 in words is "sixteen billion, six hundred eighty-four million, one hundred twenty thousand, eight hundred sixty-five".