16010921785 has 4 divisors (see below), whose sum is σ = 19213106148. Its totient is φ = 12808737424.

The previous prime is 16010921741. The next prime is 16010921789. The reversal of 16010921785 is 58712901061.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3498485904 + 12512435881 = 59148^2 + 111859^2 .

It is a cyclic number.

It is not a de Polignac number, because 16010921785 - 2²¹ = 16008824633 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16010921789) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1601092174 + ... + 1601092183.

It is an arithmetic number, because the mean of its divisors is an integer number (4803276537).

Almost surely, 2^16010921785 is an apocalyptic number.

It is an amenable number.

16010921785 is a deficient number, since it is larger than the sum of its proper divisors (3202184363).

16010921785 is an equidigital number, since it uses as much as digits as its factorization.

16010921785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202184362.

The product of its (nonzero) digits is 30240, while the sum is 40.

The spelling of 16010921785 in words is "sixteen billion, ten million, nine hundred twenty-one thousand, seven hundred eighty-five".