666666020101 has 8 divisors (see below), whose sum is σ = 671239180800. Its totient is φ = 662104138560.

The previous prime is 666666019991. The next prime is 666666020123. The reversal of 666666020101 is 101020666666.

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 666666020101 - 2¹⁵ = 666665987333 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 (666666020701) 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, 2701156 + ... + 2937613.

It is an arithmetic number, because the mean of its divisors is an integer number (83904897600).

Almost surely, 2^666666020101 is an apocalyptic number.

It is an amenable number.

666666020101 is a deficient number, since it is larger than the sum of its proper divisors (4573160699).

666666020101 is a wasteful number, since it uses less digits than its factorization.

666666020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5639579.

The product of its (nonzero) digits is 93312, while the sum is 40.

Adding to 666666020101 its reverse (101020666666), we get a palindrome (767686686767).

The spelling of 666666020101 in words is "six hundred sixty-six billion, six hundred sixty-six million, twenty thousand, one hundred one".