161606115611 has 4 divisors (see below), whose sum is σ = 161855893872. Its totient is φ = 161356337352.

The previous prime is 161606115557. The next prime is 161606115617. The reversal of 161606115611 is 116511606161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116511606161 = 23 ⋅5065722007.

It is a cyclic number.

It is not a de Polignac number, because 161606115611 - 2¹⁸ = 161605853467 is a prime.

It is a super-2 number, since 2×161606115611² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161606115617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124888160 + ... + 124889453.

It is an arithmetic number, because the mean of its divisors is an integer number (40463973468).

Almost surely, 2^161606115611 is an apocalyptic number.

161606115611 is a deficient number, since it is larger than the sum of its proper divisors (249778261).

161606115611 is an equidigital number, since it uses as much as digits as its factorization.

161606115611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249778260.

The product of its (nonzero) digits is 6480, while the sum is 35.

The spelling of 161606115611 in words is "one hundred sixty-one billion, six hundred six million, one hundred fifteen thousand, six hundred eleven".