1661488734089 has 4 divisors (see below), whose sum is σ = 1759223365524. Its totient is φ = 1563754102656.

The previous prime is 1661488734047. The next prime is 1661488734203. The reversal of 1661488734089 is 9804378841661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1378257216064 + 283231518025 = 1173992^2 + 532195^2 .

It is a cyclic number.

It is not a de Polignac number, because 1661488734089 - 2¹² = 1661488729993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1661488734889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48867315692 + ... + 48867315725.

It is an arithmetic number, because the mean of its divisors is an integer number (439805841381).

Almost surely, 2^{1661488734089} is an apocalyptic number.

It is an amenable number.

1661488734089 is a deficient number, since it is larger than the sum of its proper divisors (97734631435).

1661488734089 is an equidigital number, since it uses as much as digits as its factorization.

1661488734089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97734631434.

The product of its (nonzero) digits is 55738368, while the sum is 65.

The spelling of 1661488734089 in words is "one trillion, six hundred sixty-one billion, four hundred eighty-eight million, seven hundred thirty-four thousand, eighty-nine".