1179665681 has 2 divisors, whose sum is σ = 1179665682. Its totient is φ = 1179665680.

The previous prime is 1179665659. The next prime is 1179665693. The reversal of 1179665681 is 1865669711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1146499600 + 33166081 = 33860^2 + 5759^2 .

It is an emirp because it is prime and its reverse (1865669711) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1179665681 is a prime.

It is a super-2 number, since 2×1179665681² = 2783222237858387522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1179665621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 589832840 + 589832841.

It is an arithmetic number, because the mean of its divisors is an integer number (589832841).

Almost surely, 2^1179665681 is an apocalyptic number.

It is an amenable number.

1179665681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1179665681 is an equidigital number, since it uses as much as digits as its factorization.

1179665681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 50.

The square root of 1179665681 is about 34346.2615287312. The cubic root of 1179665681 is about 1056.6219986071.

It can be divided in two parts, 11796 and 65681, that added together give a palindrome (77477).

The spelling of 1179665681 in words is "one billion, one hundred seventy-nine million, six hundred sixty-five thousand, six hundred eighty-one".