1166555642519 has 2 divisors, whose sum is σ = 1166555642520. Its totient is φ = 1166555642518.

The previous prime is 1166555642501. The next prime is 1166555642521. The reversal of 1166555642519 is 9152465556611.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1166555642519 is a prime.

It is a super-2 number, since 2×1166555642519² (a number of 25 digits) contains 22 as substring.

Together with 1166555642521, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1166555642579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583277821259 + 583277821260.

It is an arithmetic number, because the mean of its divisors is an integer number (583277821260).

Almost surely, 2^{1166555642519} is an apocalyptic number.

1166555642519 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166555642519 is an equidigital number, since it uses as much as digits as its factorization.

1166555642519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720000, while the sum is 56.

The spelling of 1166555642519 in words is "one trillion, one hundred sixty-six billion, five hundred fifty-five million, six hundred forty-two thousand, five hundred nineteen".