111100660681 has 2 divisors, whose sum is σ = 111100660682. Its totient is φ = 111100660680.

The previous prime is 111100660669. The next prime is 111100660709. The reversal of 111100660681 is 186066001111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94070410681 + 17030250000 = 306709^2 + 130500^2 .

It is an emirp because it is prime and its reverse (186066001111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111100660681 - 2³³ = 102510726089 is a prime.

It is a super-2 number, since 2×111100660681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111100660081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550330340 + 55550330341.

It is an arithmetic number, because the mean of its divisors is an integer number (55550330341).

Almost surely, 2^111100660681 is an apocalyptic number.

It is an amenable number.

111100660681 is a deficient number, since it is larger than the sum of its proper divisors (1).

111100660681 is an equidigital number, since it uses as much as digits as its factorization.

111100660681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 31.

Adding to 111100660681 its reverse (186066001111), we get a palindrome (297166661792).

The spelling of 111100660681 in words is "one hundred eleven billion, one hundred million, six hundred sixty thousand, six hundred eighty-one".