150666221 has 2 divisors, whose sum is σ = 150666222. Its totient is φ = 150666220.

The previous prime is 150666209. The next prime is 150666239. The reversal of 150666221 is 122666051.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122988100 + 27678121 = 11090^2 + 5261^2 .

It is an emirp because it is prime and its reverse (122666051) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 150666221 - 2¹⁰ = 150665197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (150666251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75333110 + 75333111.

It is an arithmetic number, because the mean of its divisors is an integer number (75333111).

Almost surely, 2^150666221 is an apocalyptic number.

It is an amenable number.

150666221 is a deficient number, since it is larger than the sum of its proper divisors (1).

150666221 is an equidigital number, since it uses as much as digits as its factorization.

150666221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 150666221 is about 12274.6169390332. The cubic root of 150666221 is about 532.1147511432.

The spelling of 150666221 in words is "one hundred fifty million, six hundred sixty-six thousand, two hundred twenty-one".