161110661 has 2 divisors, whose sum is σ = 161110662. Its totient is φ = 161110660.

The previous prime is 161110657. The next prime is 161110681. The reversal of 161110661 is 166011161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99880036 + 61230625 = 9994^2 + 7825^2 .

It is a cyclic number.

It is not a de Polignac number, because 161110661 - 2² = 161110657 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161110681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80555330 + 80555331.

It is an arithmetic number, because the mean of its divisors is an integer number (80555331).

Almost surely, 2^161110661 is an apocalyptic number.

It is an amenable number.

161110661 is a deficient number, since it is larger than the sum of its proper divisors (1).

161110661 is an equidigital number, since it uses as much as digits as its factorization.

161110661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 161110661 is about 12692.9374456821. The cubic root of 161110661 is about 544.1367936070.

The spelling of 161110661 in words is "one hundred sixty-one million, one hundred ten thousand, six hundred sixty-one".