3661742655689 has 2 divisors, whose sum is σ = 3661742655690. Its totient is φ = 3661742655688.

The previous prime is 3661742655671. The next prime is 3661742655731. The reversal of 3661742655689 is 9865562471663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3152613313600 + 509129342089 = 1775560^2 + 713533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3661742655689 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3661742655289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1830871327844 + 1830871327845.

It is an arithmetic number, because the mean of its divisors is an integer number (1830871327845).

Almost surely, 2^{3661742655689} is an apocalyptic number.

It is an amenable number.

3661742655689 is a deficient number, since it is larger than the sum of its proper divisors (1).

3661742655689 is an equidigital number, since it uses as much as digits as its factorization.

3661742655689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 391910400, while the sum is 68.

The spelling of 3661742655689 in words is "three trillion, six hundred sixty-one billion, seven hundred forty-two million, six hundred fifty-five thousand, six hundred eighty-nine".