1187804666249 has 2 divisors, whose sum is σ = 1187804666250. Its totient is φ = 1187804666248.

The previous prime is 1187804666227. The next prime is 1187804666333. The reversal of 1187804666249 is 9426664087811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 718349478025 + 469455188224 = 847555^2 + 685168^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187804666249 - 2¹² = 1187804662153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1187804666191 and 1187804666200.

It is not a weakly prime, because it can be changed into another prime (1187804666149) 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, 593902333124 + 593902333125.

It is an arithmetic number, because the mean of its divisors is an integer number (593902333125).

Almost surely, 2^{1187804666249} is an apocalyptic number.

It is an amenable number.

1187804666249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187804666249 is an equidigital number, since it uses as much as digits as its factorization.

1187804666249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27869184, while the sum is 62.

The spelling of 1187804666249 in words is "one trillion, one hundred eighty-seven billion, eight hundred four million, six hundred sixty-six thousand, two hundred forty-nine".