1611747616361 has 2 divisors, whose sum is σ = 1611747616362. Its totient is φ = 1611747616360.

The previous prime is 1611747616343. The next prime is 1611747616387. The reversal of 1611747616361 is 1636167471161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1198981200400 + 412766415961 = 1094980^2 + 642469^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611747616361 - 2²⁶ = 1611680507497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1611747616561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805873808180 + 805873808181.

It is an arithmetic number, because the mean of its divisors is an integer number (805873808181).

Almost surely, 2^{1611747616361} is an apocalyptic number.

It is an amenable number.

1611747616361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611747616361 is an equidigital number, since it uses as much as digits as its factorization.

1611747616361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 50.

The spelling of 1611747616361 in words is "one trillion, six hundred eleven billion, seven hundred forty-seven million, six hundred sixteen thousand, three hundred sixty-one".