166710521 has 2 divisors, whose sum is σ = 166710522. Its totient is φ = 166710520.

The previous prime is 166710497. The next prime is 166710559. The reversal of 166710521 is 125017661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150798400 + 15912121 = 12280^2 + 3989^2 .

It is an emirp because it is prime and its reverse (125017661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166710521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166710571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83355260 + 83355261.

It is an arithmetic number, because the mean of its divisors is an integer number (83355261).

Almost surely, 2^166710521 is an apocalyptic number.

It is an amenable number.

166710521 is a deficient number, since it is larger than the sum of its proper divisors (1).

166710521 is an equidigital number, since it uses as much as digits as its factorization.

166710521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 166710521 is about 12911.6428466714. The cubic root of 166710521 is about 550.3694718556.

The spelling of 166710521 in words is "one hundred sixty-six million, seven hundred ten thousand, five hundred twenty-one".