1666660100001 has 32 divisors (see below), whose sum is σ = 2401008355200. Its totient is φ = 1022274432000.

The previous prime is 1666660099967. The next prime is 1666660100041. The reversal of 1666660100001 is 1000010666661.

It is not a de Polignac number, because 1666660100001 - 2⁷ = 1666660099873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666660100041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20148675 + ... + 20231223.

It is an arithmetic number, because the mean of its divisors is an integer number (75031511100).

Almost surely, 2^{1666660100001} is an apocalyptic number.

It is an amenable number.

1666660100001 is a deficient number, since it is larger than the sum of its proper divisors (734348255199).

1666660100001 is a wasteful number, since it uses less digits than its factorization.

1666660100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84257.

The product of its (nonzero) digits is 7776, while the sum is 33.

Adding to 1666660100001 its reverse (1000010666661), we get a palindrome (2666670766662).

The spelling of 1666660100001 in words is "one trillion, six hundred sixty-six billion, six hundred sixty million, one hundred thousand, one".