1168818661 has 2 divisors, whose sum is σ = 1168818662. Its totient is φ = 1168818660.

The previous prime is 1168818619. The next prime is 1168818683. The reversal of 1168818661 is 1668188611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1036453636 + 132365025 = 32194^2 + 11505^2 .

It is an emirp because it is prime and its reverse (1668188611) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1998188911 and 1198818991.

It is a cyclic number.

It is not a de Polignac number, because 1168818661 - 2¹⁷ = 1168687589 is a prime.

It is a super-2 number, since 2×1168818661² = 2732274124603665842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1168818601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 584409330 + 584409331.

It is an arithmetic number, because the mean of its divisors is an integer number (584409331).

Almost surely, 2^1168818661 is an apocalyptic number.

It is an amenable number.

1168818661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1168818661 is an equidigital number, since it uses as much as digits as its factorization.

1168818661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 46.

The square root of 1168818661 is about 34187.9900111136. The cubic root of 1168818661 is about 1053.3734768011.

The spelling of 1168818661 in words is "one billion, one hundred sixty-eight million, eight hundred eighteen thousand, six hundred sixty-one".