666001664001 has 48 divisors (see below), whose sum is σ = 1031920441344. Its totient is φ = 412833117312.

The previous prime is 666001663997. The next prime is 666001664011. The reversal of 666001664001 is 100466100666.

It is not a de Polignac number, because 666001664001 - 2² = 666001663997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666001664011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8285335 + ... + 8365331.

It is an arithmetic number, because the mean of its divisors is an integer number (21498342528).

Almost surely, 2^666001664001 is an apocalyptic number.

It is an amenable number.

666001664001 is a deficient number, since it is larger than the sum of its proper divisors (365918777343).

666001664001 is a wasteful number, since it uses less digits than its factorization.

666001664001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81150 (or 81147 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

Adding to 666001664001 its reverse (100466100666), we get a palindrome (766467764667).

The spelling of 666001664001 in words is "six hundred sixty-six billion, one million, six hundred sixty-four thousand, one".