150666209 has 2 divisors, whose sum is σ = 150666210. Its totient is φ = 150666208.

The previous prime is 150666163. The next prime is 150666221. The reversal of 150666209 is 902666051.

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., 114425809 + 36240400 = 10697^2 + 6020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-150666209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (150666239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75333104 + 75333105.

It is an arithmetic number, because the mean of its divisors is an integer number (75333105).

Almost surely, 2^150666209 is an apocalyptic number.

It is an amenable number.

150666209 is a deficient number, since it is larger than the sum of its proper divisors (1).

150666209 is an equidigital number, since it uses as much as digits as its factorization.

150666209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 150666209 is about 12274.6164502195. The cubic root of 150666209 is about 532.1147370162.

The spelling of 150666209 in words is "one hundred fifty million, six hundred sixty-six thousand, two hundred nine".