166420097 has 2 divisors, whose sum is σ = 166420098. Its totient is φ = 166420096.

The previous prime is 166420073. The next prime is 166420099. The reversal of 166420097 is 790024661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163430656 + 2989441 = 12784^2 + 1729^2 .

It is an emirp because it is prime and its reverse (790024661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166420097 is a prime.

Together with 166420099, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166420099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83210048 + 83210049.

It is an arithmetic number, because the mean of its divisors is an integer number (83210049).

Almost surely, 2^166420097 is an apocalyptic number.

It is an amenable number.

166420097 is a deficient number, since it is larger than the sum of its proper divisors (1).

166420097 is an equidigital number, since it uses as much as digits as its factorization.

166420097 is an odious number, because the sum of its binary digits is odd.

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

The square root of 166420097 is about 12900.3913506529. The cubic root of 166420097 is about 550.0496891747.

The spelling of 166420097 in words is "one hundred sixty-six million, four hundred twenty thousand, ninety-seven".