1161681728771 has 2 divisors, whose sum is σ = 1161681728772. Its totient is φ = 1161681728770.

The previous prime is 1161681728759. The next prime is 1161681728783. The reversal of 1161681728771 is 1778271861611.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1161681728759) and next prime (1161681728783).

It is a cyclic number.

It is not a de Polignac number, because 1161681728771 - 2⁶ = 1161681728707 is a prime.

It is not a weakly prime, because it can be changed into another prime (1161681728731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580840864385 + 580840864386.

It is an arithmetic number, because the mean of its divisors is an integer number (580840864386).

Almost surely, 2^{1161681728771} is an apocalyptic number.

1161681728771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161681728771 is an equidigital number, since it uses as much as digits as its factorization.

1161681728771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1580544, while the sum is 56.

The spelling of 1161681728771 in words is "one trillion, one hundred sixty-one billion, six hundred eighty-one million, seven hundred twenty-eight thousand, seven hundred seventy-one".