17121606647 has 4 divisors (see below), whose sum is σ = 17246582016. Its totient is φ = 16996631280.

The previous prime is 17121606643. The next prime is 17121606653. The reversal of 17121606647 is 74660612171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74660612171 = 37 ⋅2017854383.

It is a cyclic number.

It is not a de Polignac number, because 17121606647 - 2² = 17121606643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17121606643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62487479 + ... + 62487752.

It is an arithmetic number, because the mean of its divisors is an integer number (4311645504).

Almost surely, 2^17121606647 is an apocalyptic number.

17121606647 is a deficient number, since it is larger than the sum of its proper divisors (124975369).

17121606647 is a wasteful number, since it uses less digits than its factorization.

17121606647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124975368.

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 17121606647 in words is "seventeen billion, one hundred twenty-one million, six hundred six thousand, six hundred forty-seven".