6665560161 has 32 divisors (see below), whose sum is σ = 9806641152. Its totient is φ = 4001175360.

The previous prime is 6665560093. The next prime is 6665560171. The reversal of 6665560161 is 1610655666.

It is not a de Polignac number, because 6665560161 - 2¹³ = 6665551969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6665560171) 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 in 31 ways as a sum of consecutive naturals, for example, 1525566 + ... + 1529928.

It is an arithmetic number, because the mean of its divisors is an integer number (306457536).

Almost surely, 2^6665560161 is an apocalyptic number.

It is an amenable number.

6665560161 is a deficient number, since it is larger than the sum of its proper divisors (3141080991).

6665560161 is a wasteful number, since it uses less digits than its factorization.

6665560161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5333.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 6665560161 is about 81642.8818758868. The cubic root of 6665560161 is about 1881.9679258309.

The spelling of 6665560161 in words is "six billion, six hundred sixty-five million, five hundred sixty thousand, one hundred sixty-one".