16555151665 has 8 divisors (see below), whose sum is σ = 21394349928. Its totient is φ = 12225342720.

The previous prime is 16555151659. The next prime is 16555151677. The reversal of 16555151665 is 56615155561.

It is a happy number.

16555151665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 387774864 + 16167376801 = 19692^2 + 127151^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16555151665 - 2¹⁹ = 16554627377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127347256 + ... + 127347385.

It is an arithmetic number, because the mean of its divisors is an integer number (2674293741).

Almost surely, 2^16555151665 is an apocalyptic number.

It is an amenable number.

16555151665 is a deficient number, since it is larger than the sum of its proper divisors (4839198263).

16555151665 is a wasteful number, since it uses less digits than its factorization.

16555151665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254694659.

The product of its digits is 675000, while the sum is 46.

The spelling of 16555151665 in words is "sixteen billion, five hundred fifty-five million, one hundred fifty-one thousand, six hundred sixty-five".