166829561 has 2 divisors, whose sum is σ = 166829562. Its totient is φ = 166829560.

The previous prime is 166829503. The next prime is 166829567. The reversal of 166829561 is 165928661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92525161 + 74304400 = 9619^2 + 8620^2 .

It is a cyclic number.

It is not a de Polignac number, because 166829561 - 2¹⁴ = 166813177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166829567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83414780 + 83414781.

It is an arithmetic number, because the mean of its divisors is an integer number (83414781).

Almost surely, 2^166829561 is an apocalyptic number.

It is an amenable number.

166829561 is a deficient number, since it is larger than the sum of its proper divisors (1).

166829561 is an equidigital number, since it uses as much as digits as its factorization.

166829561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 166829561 is about 12916.2518169940. The cubic root of 166829561 is about 550.5004381833.

The spelling of 166829561 in words is "one hundred sixty-six million, eight hundred twenty-nine thousand, five hundred sixty-one".