1611360661289 has 4 divisors (see below), whose sum is σ = 1611363237060. Its totient is φ = 1611358085520.

The previous prime is 1611360661271. The next prime is 1611360661333. The reversal of 1611360661289 is 9821660631161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 395395728025 + 1215964933264 = 628805^2 + 1102708^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611360661289 - 2⁸ = 1611360661033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1611360661219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317759 + ... + 1823099.

It is an arithmetic number, because the mean of its divisors is an integer number (402840809265).

Almost surely, 2^{1611360661289} is an apocalyptic number.

It is an amenable number.

1611360661289 is a deficient number, since it is larger than the sum of its proper divisors (2575771).

1611360661289 is a wasteful number, since it uses less digits than its factorization.

1611360661289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575770.

The product of its (nonzero) digits is 559872, while the sum is 50.

The spelling of 1611360661289 in words is "one trillion, six hundred eleven billion, three hundred sixty million, six hundred sixty-one thousand, two hundred eighty-nine".