166238101 has 2 divisors, whose sum is σ = 166238102. Its totient is φ = 166238100.

The previous prime is 166238099. The next prime is 166238119. The reversal of 166238101 is 101832661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158785201 + 7452900 = 12601^2 + 2730^2 .

It is a cyclic number.

It is not a de Polignac number, because 166238101 - 2¹ = 166238099 is a prime.

Together with 166238099, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166238101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166238131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83119050 + 83119051.

It is an arithmetic number, because the mean of its divisors is an integer number (83119051).

Almost surely, 2^166238101 is an apocalyptic number.

It is an amenable number.

166238101 is a deficient number, since it is larger than the sum of its proper divisors (1).

166238101 is an equidigital number, since it uses as much as digits as its factorization.

166238101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 166238101 is about 12893.3355265424. The cubic root of 166238101 is about 549.8491057129.

The spelling of 166238101 in words is "one hundred sixty-six million, two hundred thirty-eight thousand, one hundred one".