1187804666149 has 2 divisors, whose sum is σ = 1187804666150. Its totient is φ = 1187804666148.

The previous prime is 1187804666141. The next prime is 1187804666171. The reversal of 1187804666149 is 9416664087811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1073099169025 + 114705497124 = 1035905^2 + 338682^2 .

It is an emirp because it is prime and its reverse (9416664087811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1187804666149 - 2³ = 1187804666141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1187804666141) 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 as a sum of consecutive naturals, namely, 593902333074 + 593902333075.

It is an arithmetic number, because the mean of its divisors is an integer number (593902333075).

Almost surely, 2^{1187804666149} is an apocalyptic number.

It is an amenable number.

1187804666149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187804666149 is an equidigital number, since it uses as much as digits as its factorization.

1187804666149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13934592, while the sum is 61.

The spelling of 1187804666149 in words is "one trillion, one hundred eighty-seven billion, eight hundred four million, six hundred sixty-six thousand, one hundred forty-nine".