666061 has 8 divisors (see below), whose sum is σ = 733248. Its totient is φ = 600000.

The previous prime is 666041. The next prime is 666067. The reversal of 666061 is 160666.

666061 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 5-Lehmer number, since φ(666061) divides (666061-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 666061 - 2⁹ = 665549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666067) 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, 1461 + ... + 1861.

It is an arithmetic number, because the mean of its divisors is an integer number (91656).

2⁶⁶⁶⁰⁶¹ is an apocalyptic number.

It is an amenable number.

666061 is a deficient number, since it is larger than the sum of its proper divisors (67187).

666061 is a wasteful number, since it uses less digits than its factorization.

666061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 666061 is about 816.1256030783. The cubic root of 666061 is about 87.3315835297.

The spelling of 666061 in words is "six hundred sixty-six thousand, sixty-one".