161606056111655 has 4 divisors (see below), whose sum is σ = 193927267333992. Its totient is φ = 129284844889320.

The previous prime is 161606056111637. The next prime is 161606056111663. The reversal of 161606056111655 is 556111650606161.

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

It is not a de Polignac number, because 161606056111655 - 2⁴⁶ = 91237311933991 is a prime.

It is a super-3 number, since 3×161606056111655³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 16160605611161 + ... + 16160605611170.

It is an arithmetic number, because the mean of its divisors is an integer number (48481816833498).

Almost surely, 2^{161606056111655} is an apocalyptic number.

161606056111655 is a deficient number, since it is larger than the sum of its proper divisors (32321211222337).

161606056111655 is an equidigital number, since it uses as much as digits as its factorization.

161606056111655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32321211222336.

The product of its (nonzero) digits is 972000, while the sum is 50.

The spelling of 161606056111655 in words is "one hundred sixty-one trillion, six hundred six billion, fifty-six million, one hundred eleven thousand, six hundred fifty-five".