666161105 has 8 divisors (see below), whose sum is σ = 799735464. Its totient is φ = 532700800.

The previous prime is 666161047. The next prime is 666161123. The reversal of 666161105 is 501161666.

It can be written as a sum of positive squares in 4 ways, for example, as 59474944 + 606686161 = 7712^2 + 24631^2 .

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

It is not a de Polignac number, because 666161105 - 2¹⁰ = 666160081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15086 + ... + 39495.

It is an arithmetic number, because the mean of its divisors is an integer number (99966933).

Almost surely, 2^666161105 is an apocalyptic number.

It is an amenable number.

666161105 is a deficient number, since it is larger than the sum of its proper divisors (133574359).

666161105 is a wasteful number, since it uses less digits than its factorization.

666161105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57027.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 666161105 is about 25810.0969583611. The cubic root of 666161105 is about 873.3595844947.

The spelling of 666161105 in words is "six hundred sixty-six million, one hundred sixty-one thousand, one hundred five".