666651161 has 8 divisors (see below), whose sum is σ = 728248800. Its totient is φ = 605219040.

The previous prime is 666651121. The next prime is 666651169. The reversal of 666651161 is 161156666.

It is a happy number.

666651161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666651161 - 2¹⁴ = 666634777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666651169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32876 + ... + 49133.

It is an arithmetic number, because the mean of its divisors is an integer number (91031100).

Almost surely, 2^666651161 is an apocalyptic number.

It is an amenable number.

666651161 is a deficient number, since it is larger than the sum of its proper divisors (61597639).

666651161 is a wasteful number, since it uses less digits than its factorization.

666651161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82759.

The product of its digits is 38880, while the sum is 38.

The square root of 666651161 is about 25819.5887070263. The cubic root of 666651161 is about 873.5736919600.

The spelling of 666651161 in words is "six hundred sixty-six million, six hundred fifty-one thousand, one hundred sixty-one".