16001217665 has 8 divisors (see below), whose sum is σ = 19432804608. Its totient is φ = 12646745200.

The previous prime is 16001217653. The next prime is 16001217697. The reversal of 16001217665 is 56671210061.

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

It is not a de Polignac number, because 16001217665 - 2¹⁰ = 16001216641 is a prime.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 19278161 + ... + 19278990.

It is an arithmetic number, because the mean of its divisors is an integer number (2429100576).

Almost surely, 2^16001217665 is an apocalyptic number.

It is an amenable number.

16001217665 is a deficient number, since it is larger than the sum of its proper divisors (3431586943).

16001217665 is an equidigital number, since it uses as much as digits as its factorization.

16001217665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38557239.

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 16001217665 in words is "sixteen billion, one million, two hundred seventeen thousand, six hundred sixty-five".