166668660101 has 2 divisors, whose sum is σ = 166668660102. Its totient is φ = 166668660100.

The previous prime is 166668660089. The next prime is 166668660157. The reversal of 166668660101 is 101066866661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86656051876 + 80012608225 = 294374^2 + 282865^2 .

It is an emirp because it is prime and its reverse (101066866661) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 101099899991 and 199998990101.

It is a cyclic number.

It is not a de Polignac number, because 166668660101 - 2²² = 166664465797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166668620101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83334330050 + 83334330051.

It is an arithmetic number, because the mean of its divisors is an integer number (83334330051).

Almost surely, 2^166668660101 is an apocalyptic number.

It is an amenable number.

166668660101 is a deficient number, since it is larger than the sum of its proper divisors (1).

166668660101 is an equidigital number, since it uses as much as digits as its factorization.

166668660101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 166668660101 in words is "one hundred sixty-six billion, six hundred sixty-eight million, six hundred sixty thousand, one hundred one".