1118066681 has 2 divisors, whose sum is σ = 1118066682. Its totient is φ = 1118066680.

The previous prime is 1118066671. The next prime is 1118066713. The reversal of 1118066681 is 1866608111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 735277456 + 382789225 = 27116^2 + 19565^2 .

It is an emirp because it is prime and its reverse (1866608111) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1899908111 and 1118099981.

It is a cyclic number.

It is not a de Polignac number, because 1118066681 - 2¹⁸ = 1117804537 is a prime.

It is a super-2 number, since 2×1118066681² = 2500146206324711522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1118066671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 559033340 + 559033341.

It is an arithmetic number, because the mean of its divisors is an integer number (559033341).

Almost surely, 2^1118066681 is an apocalyptic number.

It is an amenable number.

1118066681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1118066681 is an equidigital number, since it uses as much as digits as its factorization.

1118066681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 1118066681 is about 33437.5041084110. The cubic root of 1118066681 is about 1037.9009317231.

The spelling of 1118066681 in words is "one billion, one hundred eighteen million, sixty-six thousand, six hundred eighty-one".