166850261 has 2 divisors, whose sum is σ = 166850262. Its totient is φ = 166850260.

The previous prime is 166850251. The next prime is 166850273. The reversal of 166850261 is 162058661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146555236 + 20295025 = 12106^2 + 4505^2 .

It is an emirp because it is prime and its reverse (162058661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166850261 is a prime.

It is a Chen prime.

It is equal to p_9336653 and since 166850261 and 9336653 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166850231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83425130 + 83425131.

It is an arithmetic number, because the mean of its divisors is an integer number (83425131).

Almost surely, 2^166850261 is an apocalyptic number.

It is an amenable number.

166850261 is a deficient number, since it is larger than the sum of its proper divisors (1).

166850261 is an equidigital number, since it uses as much as digits as its factorization.

166850261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 166850261 is about 12917.0531081977. The cubic root of 166850261 is about 550.5232057067.

The spelling of 166850261 in words is "one hundred sixty-six million, eight hundred fifty thousand, two hundred sixty-one".