166747601 has 2 divisors, whose sum is σ = 166747602. Its totient is φ = 166747600.

The previous prime is 166747589. The next prime is 166747619. The reversal of 166747601 is 106747661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157753600 + 8994001 = 12560^2 + 2999^2 .

It is an emirp because it is prime and its reverse (106747661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166747601 - 2¹⁰ = 166746577 is a prime.

It is not a weakly prime, because it can be changed into another prime (166747621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83373800 + 83373801.

It is an arithmetic number, because the mean of its divisors is an integer number (83373801).

Almost surely, 2^166747601 is an apocalyptic number.

It is an amenable number.

166747601 is a deficient number, since it is larger than the sum of its proper divisors (1).

166747601 is an equidigital number, since it uses as much as digits as its factorization.

166747601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 166747601 is about 12913.0786801599. The cubic root of 166747601 is about 550.4102734940.

The spelling of 166747601 in words is "one hundred sixty-six million, seven hundred forty-seven thousand, six hundred one".