133564309909 has 2 divisors, whose sum is σ = 133564309910. Its totient is φ = 133564309908.

The previous prime is 133564309849. The next prime is 133564309939. The reversal of 133564309909 is 909903465331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78709985809 + 54854324100 = 280553^2 + 234210^2 .

It is a cyclic number.

It is not a de Polignac number, because 133564309909 - 2⁹ = 133564309397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133564309939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66782154954 + 66782154955.

It is an arithmetic number, because the mean of its divisors is an integer number (66782154955).

Almost surely, 2^133564309909 is an apocalyptic number.

It is an amenable number.

133564309909 is a deficient number, since it is larger than the sum of its proper divisors (1).

133564309909 is an equidigital number, since it uses as much as digits as its factorization.

133564309909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2361960, while the sum is 52.

The spelling of 133564309909 in words is "one hundred thirty-three billion, five hundred sixty-four million, three hundred nine thousand, nine hundred nine".