166642037 has 2 divisors, whose sum is σ = 166642038. Its totient is φ = 166642036.

The previous prime is 166642013. The next prime is 166642039. The reversal of 166642037 is 730246661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109956196 + 56685841 = 10486^2 + 7529^2 .

It is a cyclic number.

It is not a de Polignac number, because 166642037 - 2¹² = 166637941 is a prime.

Together with 166642039, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 166641988 and 166642006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166642039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83321018 + 83321019.

It is an arithmetic number, because the mean of its divisors is an integer number (83321019).

Almost surely, 2^166642037 is an apocalyptic number.

It is an amenable number.

166642037 is a deficient number, since it is larger than the sum of its proper divisors (1).

166642037 is an equidigital number, since it uses as much as digits as its factorization.

166642037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 166642037 is about 12908.9905492258. The cubic root of 166642037 is about 550.2940983578.

Adding to 166642037 its reverse (730246661), we get a palindrome (896888698).

The spelling of 166642037 in words is "one hundred sixty-six million, six hundred forty-two thousand, thirty-seven".