17042120505 has 12 divisors (see below), whose sum is σ = 29539675620. Its totient is φ = 9089130912.

The previous prime is 17042120477. The next prime is 17042120519. The reversal of 17042120505 is 50502124071.

17042120505 is a `hidden beast` number, since 170 + 421 + 20 + 50 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4593586176 + 12448534329 = 67776^2 + 111573^2 .

It is not a de Polignac number, because 17042120505 - 2¹⁰ = 17042119481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189356850 + ... + 189356939.

It is an arithmetic number, because the mean of its divisors is an integer number (2461639635).

Almost surely, 2^17042120505 is an apocalyptic number.

17042120505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

17042120505 is a deficient number, since it is larger than the sum of its proper divisors (12497555115).

17042120505 is a wasteful number, since it uses less digits than its factorization.

17042120505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378713800 (or 378713797 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

Adding to 17042120505 its reverse (50502124071), we get a palindrome (67544244576).

The spelling of 17042120505 in words is "seventeen billion, forty-two million, one hundred twenty thousand, five hundred five".