166299401 has 2 divisors, whose sum is σ = 166299402. Its totient is φ = 166299400.

The previous prime is 166299383. The next prime is 166299431. The reversal of 166299401 is 104992661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87516025 + 78783376 = 9355^2 + 8876^2 .

It is a cyclic number.

It is not a de Polignac number, because 166299401 - 2⁶ = 166299337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (166299431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83149700 + 83149701.

It is an arithmetic number, because the mean of its divisors is an integer number (83149701).

Almost surely, 2^166299401 is an apocalyptic number.

It is an amenable number.

166299401 is a deficient number, since it is larger than the sum of its proper divisors (1).

166299401 is an equidigital number, since it uses as much as digits as its factorization.

166299401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 166299401 is about 12895.7125045497. The cubic root of 166299401 is about 549.9166826960.

The spelling of 166299401 in words is "one hundred sixty-six million, two hundred ninety-nine thousand, four hundred one".