16217609865 has 8 divisors (see below), whose sum is σ = 25948175808. Its totient is φ = 8649391920.

The previous prime is 16217609861. The next prime is 16217609887. The reversal of 16217609865 is 56890671261.

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

It is not a de Polignac number, because 16217609865 - 2² = 16217609861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16217609861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540586981 + ... + 540587010.

It is an arithmetic number, because the mean of its divisors is an integer number (3243521976).

Almost surely, 2^16217609865 is an apocalyptic number.

16217609865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16217609865 is a deficient number, since it is larger than the sum of its proper divisors (9730565943).

16217609865 is a wasteful number, since it uses less digits than its factorization.

16217609865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081173999.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 16217609865 in words is "sixteen billion, two hundred seventeen million, six hundred nine thousand, eight hundred sixty-five".