17661120005 has 4 divisors (see below), whose sum is σ = 21193344012. Its totient is φ = 14128896000.

The previous prime is 17661119981. The next prime is 17661120011. The reversal of 17661120005 is 50002116671.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3978203329 + 13682916676 = 63073^2 + 116974^2 .

It is not a de Polignac number, because 17661120005 - 2⁶ = 17661119941 is a prime.

It is a super-2 number, since 2×17661120005² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 17661120005.

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, 1766111996 + ... + 1766112005.

It is an arithmetic number, because the mean of its divisors is an integer number (5298336003).

Almost surely, 2^17661120005 is an apocalyptic number.

It is an amenable number.

17661120005 is a deficient number, since it is larger than the sum of its proper divisors (3532224007).

17661120005 is an equidigital number, since it uses as much as digits as its factorization.

17661120005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3532224006.

The product of its (nonzero) digits is 2520, while the sum is 29.

Adding to 17661120005 its reverse (50002116671), we get a palindrome (67663236676).

The spelling of 17661120005 in words is "seventeen billion, six hundred sixty-one million, one hundred twenty thousand, five".