16503327665 has 16 divisors (see below), whose sum is σ = 21610310976. Its totient is φ = 11999112000.

The previous prime is 16503327647. The next prime is 16503327691. The reversal of 16503327665 is 56672330561.

It is a happy number.

It is not a de Polignac number, because 16503327665 - 2⁶ = 16503327601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169715 + ... + 248615.

It is an arithmetic number, because the mean of its divisors is an integer number (1350644436).

Almost surely, 2^16503327665 is an apocalyptic number.

It is an amenable number.

16503327665 is a deficient number, since it is larger than the sum of its proper divisors (5106983311).

16503327665 is a wasteful number, since it uses less digits than its factorization.

16503327665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82720.

The product of its (nonzero) digits is 680400, while the sum is 44.

The spelling of 16503327665 in words is "sixteen billion, five hundred three million, three hundred twenty-seven thousand, six hundred sixty-five".