668052161 has 4 divisors (see below), whose sum is σ = 763488192. Its totient is φ = 572616132.

The previous prime is 668052107. The next prime is 668052163. The reversal of 668052161 is 161250866.

It is a happy number.

668052161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 668052161 - 2⁶ = 668052097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668052163) 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, 47718005 + ... + 47718018.

It is an arithmetic number, because the mean of its divisors is an integer number (190872048).

Almost surely, 2^668052161 is an apocalyptic number.

It is an amenable number.

668052161 is a deficient number, since it is larger than the sum of its proper divisors (95436031).

668052161 is an equidigital number, since it uses as much as digits as its factorization.

668052161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95436030.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 668052161 is about 25846.7050317831. The cubic root of 668052161 is about 874.1852163814.

The spelling of 668052161 in words is "six hundred sixty-eight million, fifty-two thousand, one hundred sixty-one".