166051289 has 2 divisors, whose sum is σ = 166051290. Its totient is φ = 166051288.

The previous prime is 166051253. The next prime is 166051307. The reversal of 166051289 is 982150661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94090000 + 71961289 = 9700^2 + 8483^2 .

It is a cyclic number.

It is not a de Polignac number, because 166051289 - 2⁸ = 166051033 is a prime.

It is equal to p_9294392 and since 166051289 and 9294392 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (166051219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83025644 + 83025645.

It is an arithmetic number, because the mean of its divisors is an integer number (83025645).

Almost surely, 2^166051289 is an apocalyptic number.

It is an amenable number.

166051289 is a deficient number, since it is larger than the sum of its proper divisors (1).

166051289 is an equidigital number, since it uses as much as digits as its factorization.

166051289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 166051289 is about 12886.0889722212. The cubic root of 166051289 is about 549.6430620691.

The spelling of 166051289 in words is "one hundred sixty-six million, fifty-one thousand, two hundred eighty-nine".