166520429 has 2 divisors, whose sum is σ = 166520430. Its totient is φ = 166520428.

The previous prime is 166520413. The next prime is 166520441. The reversal of 166520429 is 924025661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104142025 + 62378404 = 10205^2 + 7898^2 .

It is a cyclic number.

It is not a de Polignac number, because 166520429 - 2⁴ = 166520413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166520449) 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, 83260214 + 83260215.

It is an arithmetic number, because the mean of its divisors is an integer number (83260215).

Almost surely, 2^166520429 is an apocalyptic number.

It is an amenable number.

166520429 is a deficient number, since it is larger than the sum of its proper divisors (1).

166520429 is an equidigital number, since it uses as much as digits as its factorization.

166520429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 166520429 is about 12904.2794839542. The cubic root of 166520429 is about 550.1602056719.

The spelling of 166520429 in words is "one hundred sixty-six million, five hundred twenty thousand, four hundred twenty-nine".