150505661 has 2 divisors, whose sum is σ = 150505662. Its totient is φ = 150505660.

The previous prime is 150505639. The next prime is 150505681. The reversal of 150505661 is 166505051.

150505661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140304025 + 10201636 = 11845^2 + 3194^2 .

It is a cyclic number.

It is not a de Polignac number, because 150505661 - 2¹⁴ = 150489277 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 (150505601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75252830 + 75252831.

It is an arithmetic number, because the mean of its divisors is an integer number (75252831).

Almost surely, 2^150505661 is an apocalyptic number.

It is an amenable number.

150505661 is a deficient number, since it is larger than the sum of its proper divisors (1).

150505661 is an equidigital number, since it uses as much as digits as its factorization.

150505661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 150505661 is about 12268.0748693509. The cubic root of 150505661 is about 531.9256649394.

The spelling of 150505661 in words is "one hundred fifty million, five hundred five thousand, six hundred sixty-one".