161606605160101 has 4 divisors (see below), whose sum is σ = 161611145599852. Its totient is φ = 161602064720352.

The previous prime is 161606605160093. The next prime is 161606605160123. The reversal of 161606605160101 is 101061506606161.

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 96533100915876 + 65073504244225 = 9825126^2 + 8066815^2 .

It is a cyclic number.

It is not a de Polignac number, because 161606605160101 - 2³ = 161606605160093 is a prime.

It is a super-2 number, since 2×161606605160101² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161606605160501) 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, 2270166486 + ... + 2270237671.

It is an arithmetic number, because the mean of its divisors is an integer number (40402786399963).

Almost surely, 2^{161606605160101} is an apocalyptic number.

It is an amenable number.

161606605160101 is a deficient number, since it is larger than the sum of its proper divisors (4540439751).

161606605160101 is an equidigital number, since it uses as much as digits as its factorization.

161606605160101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4540439750.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 161606605160101 in words is "one hundred sixty-one trillion, six hundred six billion, six hundred five million, one hundred sixty thousand, one hundred one".