166530653 has 2 divisors, whose sum is σ = 166530654. Its totient is φ = 166530652.

The previous prime is 166530641. The next prime is 166530697. The reversal of 166530653 is 356035661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99241444 + 67289209 = 9962^2 + 8203^2 .

It is a cyclic number.

It is not a de Polignac number, because 166530653 - 2²⁶ = 99421789 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166530053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83265326 + 83265327.

It is an arithmetic number, because the mean of its divisors is an integer number (83265327).

Almost surely, 2^166530653 is an apocalyptic number.

It is an amenable number.

166530653 is a deficient number, since it is larger than the sum of its proper divisors (1).

166530653 is an equidigital number, since it uses as much as digits as its factorization.

166530653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 35.

The square root of 166530653 is about 12904.6756255243. The cubic root of 166530653 is about 550.1714649968.

The spelling of 166530653 in words is "one hundred sixty-six million, five hundred thirty thousand, six hundred fifty-three".