16217717255 has 4 divisors (see below), whose sum is σ = 19461260712. Its totient is φ = 12974173800.

The previous prime is 16217717249. The next prime is 16217717261. The reversal of 16217717255 is 55271771261.

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

It is an interprime number because it is at equal distance from previous prime (16217717249) and next prime (16217717261).

It is a de Polignac number, because none of the positive numbers 2^k-16217717255 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1621771721 + ... + 1621771730.

It is an arithmetic number, because the mean of its divisors is an integer number (4865315178).

Almost surely, 2^16217717255 is an apocalyptic number.

16217717255 is a deficient number, since it is larger than the sum of its proper divisors (3243543457).

16217717255 is an equidigital number, since it uses as much as digits as its factorization.

16217717255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3243543456.

The product of its digits is 205800, while the sum is 44.

The spelling of 16217717255 in words is "sixteen billion, two hundred seventeen million, seven hundred seventeen thousand, two hundred fifty-five".