666542301 has 8 divisors (see below), whose sum is σ = 889035840. Its totient is φ = 444205152.

The previous prime is 666542299. The next prime is 666542311. The reversal of 666542301 is 103245666.

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

It is not a de Polignac number, because 666542301 - 2¹ = 666542299 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666542311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28761 + ... + 46478.

It is an arithmetic number, because the mean of its divisors is an integer number (111129480).

Almost surely, 2^666542301 is an apocalyptic number.

It is an amenable number.

666542301 is a deficient number, since it is larger than the sum of its proper divisors (222493539).

666542301 is a wasteful number, since it uses less digits than its factorization.

666542301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78195.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 666542301 is about 25817.4805316088. The cubic root of 666542301 is about 873.5261396496.

Adding to 666542301 its reverse (103245666), we get a palindrome (769787967).

The spelling of 666542301 in words is "six hundred sixty-six million, five hundred forty-two thousand, three hundred one".