17166520120661 has 4 divisors (see below), whose sum is σ = 17167181848032. Its totient is φ = 17165858393292.

The previous prime is 17166520120637. The next prime is 17166520120679. The reversal of 17166520120661 is 16602102566171.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 17166520120661 - 2²⁶ = 17166453011797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17166520120261) 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, 330824771 + ... + 330876656.

It is an arithmetic number, because the mean of its divisors is an integer number (4291795462008).

Almost surely, 2^{17166520120661} is an apocalyptic number.

It is an amenable number.

17166520120661 is a deficient number, since it is larger than the sum of its proper divisors (661727371).

17166520120661 is an equidigital number, since it uses as much as digits as its factorization.

17166520120661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661727370.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 17166520120661 in words is "seventeen trillion, one hundred sixty-six billion, five hundred twenty million, one hundred twenty thousand, six hundred sixty-one".