666161066 has 8 divisors (see below), whose sum is σ = 1005018084. Its totient is φ = 331155040.

The previous prime is 666161047. The next prime is 666161123. The reversal of 666161066 is 660161666.

It can be written as a sum of positive squares in 2 ways, for example, as 653876041 + 12285025 = 25571^2 + 3505^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 962315 + ... + 963006.

Almost surely, 2^666161066 is an apocalyptic number.

666161066 is a deficient number, since it is larger than the sum of its proper divisors (338857018).

666161066 is a wasteful number, since it uses less digits than its factorization.

666161066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925496.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 666161066 is about 25810.0962028428. The cubic root of 666161066 is about 873.3595674513.

The spelling of 666161066 in words is "six hundred sixty-six million, one hundred sixty-one thousand, sixty-six".