166257653 has 2 divisors, whose sum is σ = 166257654. Its totient is φ = 166257652.

The previous prime is 166257617. The next prime is 166257683. The reversal of 166257653 is 356752661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83210884 + 83046769 = 9122^2 + 9113^2 .

It is an emirp because it is prime and its reverse (356752661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166257653 - 2⁶ = 166257589 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166257653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166257683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83128826 + 83128827.

It is an arithmetic number, because the mean of its divisors is an integer number (83128827).

Almost surely, 2^166257653 is an apocalyptic number.

It is an amenable number.

166257653 is a deficient number, since it is larger than the sum of its proper divisors (1).

166257653 is an equidigital number, since it uses as much as digits as its factorization.

166257653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 41.

The square root of 166257653 is about 12894.0937254233. The cubic root of 166257653 is about 549.8706615981.

The spelling of 166257653 in words is "one hundred sixty-six million, two hundred fifty-seven thousand, six hundred fifty-three".