166021027332101 has 2 divisors, whose sum is σ = 166021027332102. Its totient is φ = 166021027332100.

The previous prime is 166021027332047. The next prime is 166021027332169. The reversal of 166021027332101 is 101233720120661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96746600920225 + 69274426411876 = 9835985^2 + 8323126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166021027332101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166021027332401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83010513666050 + 83010513666051.

It is an arithmetic number, because the mean of its divisors is an integer number (83010513666051).

Almost surely, 2^{166021027332101} is an apocalyptic number.

It is an amenable number.

166021027332101 is a deficient number, since it is larger than the sum of its proper divisors (1).

166021027332101 is an equidigital number, since it uses as much as digits as its factorization.

166021027332101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

Adding to 166021027332101 its reverse (101233720120661), we get a palindrome (267254747452762).

The spelling of 166021027332101 in words is "one hundred sixty-six trillion, twenty-one billion, twenty-seven million, three hundred thirty-two thousand, one hundred one".