3561605644109 has 2 divisors, whose sum is σ = 3561605644110. Its totient is φ = 3561605644108.

The previous prime is 3561605644049. The next prime is 3561605644211. The reversal of 3561605644109 is 9014465061653.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3485110254025 + 76495390084 = 1866845^2 + 276578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3561605644109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3561605614109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1780802822054 + 1780802822055.

It is an arithmetic number, because the mean of its divisors is an integer number (1780802822055).

Almost surely, 2^{3561605644109} is an apocalyptic number.

It is an amenable number.

3561605644109 is a deficient number, since it is larger than the sum of its proper divisors (1).

3561605644109 is an equidigital number, since it uses as much as digits as its factorization.

3561605644109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 3561605644109 in words is "three trillion, five hundred sixty-one billion, six hundred five million, six hundred forty-four thousand, one hundred nine".