1188781156553 has 2 divisors, whose sum is σ = 1188781156554. Its totient is φ = 1188781156552.

The previous prime is 1188781156523. The next prime is 1188781156573. The reversal of 1188781156553 is 3556511878811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1186905660304 + 1875496249 = 1089452^2 + 43307^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1188781156553 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1188781156492 and 1188781156501.

It is not a weakly prime, because it can be changed into another prime (1188781156523) 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 as a sum of consecutive naturals, namely, 594390578276 + 594390578277.

It is an arithmetic number, because the mean of its divisors is an integer number (594390578277).

Almost surely, 2^{1188781156553} is an apocalyptic number.

It is an amenable number.

1188781156553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188781156553 is an equidigital number, since it uses as much as digits as its factorization.

1188781156553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064000, while the sum is 59.

The spelling of 1188781156553 in words is "one trillion, one hundred eighty-eight billion, seven hundred eighty-one million, one hundred fifty-six thousand, five hundred fifty-three".