1129947866881 has 2 divisors, whose sum is σ = 1129947866882. Its totient is φ = 1129947866880.

The previous prime is 1129947866837. The next prime is 1129947866891. The reversal of 1129947866881 is 1886687499211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 609205226256 + 520742640625 = 780516^2 + 721625^2 .

It is a cyclic number.

It is not a de Polignac number, because 1129947866881 - 2⁷ = 1129947866753 is a prime.

It is a super-2 number, since 2×1129947866881² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1129947866881.

It is not a weakly prime, because it can be changed into another prime (1129947866891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564973933440 + 564973933441.

It is an arithmetic number, because the mean of its divisors is an integer number (564973933441).

Almost surely, 2^{1129947866881} is an apocalyptic number.

It is an amenable number.

1129947866881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1129947866881 is an equidigital number, since it uses as much as digits as its factorization.

1129947866881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 83607552, while the sum is 70.

The spelling of 1129947866881 in words is "one trillion, one hundred twenty-nine billion, nine hundred forty-seven million, eight hundred sixty-six thousand, eight hundred eighty-one".