1189917066645 has 24 divisors (see below), whose sum is σ = 2062810854936. Its totient is φ = 634533838848.

The previous prime is 1189917066629. The next prime is 1189917066647. The reversal of 1189917066645 is 5466607199811.

It can be written as a sum of positive squares in 4 ways, for example, as 326194045956 + 863723020689 = 571134^2 + 929367^2 .

It is not a de Polignac number, because 1189917066645 - 2⁴ = 1189917066629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189917066647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1519212 + ... + 2165141.

It is an arithmetic number, because the mean of its divisors is an integer number (85950452289).

Almost surely, 2^{1189917066645} is an apocalyptic number.

1189917066645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1189917066645 is a deficient number, since it is larger than the sum of its proper divisors (872893788291).

1189917066645 is a wasteful number, since it uses less digits than its factorization.

1189917066645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691541 (or 3691538 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

The spelling of 1189917066645 in words is "one trillion, one hundred eighty-nine billion, nine hundred seventeen million, sixty-six thousand, six hundred forty-five".