133564309849 has 2 divisors, whose sum is σ = 133564309850. Its totient is φ = 133564309848.

The previous prime is 133564309841. The next prime is 133564309909. The reversal of 133564309849 is 948903465331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97176839824 + 36387470025 = 311732^2 + 190755^2 .

It is a cyclic number.

It is not a de Polignac number, because 133564309849 - 2³ = 133564309841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133564309849.

It is not a weakly prime, because it can be changed into another prime (133564309841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66782154924 + 66782154925.

It is an arithmetic number, because the mean of its divisors is an integer number (66782154925).

Almost surely, 2^133564309849 is an apocalyptic number.

It is an amenable number.

133564309849 is a deficient number, since it is larger than the sum of its proper divisors (1).

133564309849 is an equidigital number, since it uses as much as digits as its factorization.

133564309849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 55.

The spelling of 133564309849 in words is "one hundred thirty-three billion, five hundred sixty-four million, three hundred nine thousand, eight hundred forty-nine".