1181718704809 has 2 divisors, whose sum is σ = 1181718704810. Its totient is φ = 1181718704808.

The previous prime is 1181718704773. The next prime is 1181718704821. The reversal of 1181718704809 is 9084078171811.

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., 918520976025 + 263197728784 = 958395^2 + 513028^2 .

It is an emirp because it is prime and its reverse (9084078171811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1181718704809 - 2⁹ = 1181718704297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1181718704809.

It is not a weakly prime, because it can be changed into another prime (1181718704839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590859352404 + 590859352405.

It is an arithmetic number, because the mean of its divisors is an integer number (590859352405).

Almost surely, 2^{1181718704809} is an apocalyptic number.

It is an amenable number.

1181718704809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181718704809 is an equidigital number, since it uses as much as digits as its factorization.

1181718704809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 55.

The spelling of 1181718704809 in words is "one trillion, one hundred eighty-one billion, seven hundred eighteen million, seven hundred four thousand, eight hundred nine".