6601111161 has 4 divisors (see below), whose sum is σ = 8801481552. Its totient is φ = 4400740772.

The previous prime is 6601111147. The next prime is 6601111163. The reversal of 6601111161 is 1611111066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6601111161 - 2⁵ = 6601111129 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6601111163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1100185191 + ... + 1100185196.

It is an arithmetic number, because the mean of its divisors is an integer number (2200370388).

Almost surely, 2^6601111161 is an apocalyptic number.

It is an amenable number.

6601111161 is a deficient number, since it is larger than the sum of its proper divisors (2200370391).

6601111161 is a wasteful number, since it uses less digits than its factorization.

6601111161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200370390.

The product of its (nonzero) digits is 216, while the sum is 24.

The square root of 6601111161 is about 81247.2224817563. Note that the first 3 decimals coincide. The cubic root of 6601111161 is about 1875.8827166697.

The spelling of 6601111161 in words is "six billion, six hundred one million, one hundred eleven thousand, one hundred sixty-one".