111668878613 has 2 divisors, whose sum is σ = 111668878614. Its totient is φ = 111668878612.

The previous prime is 111668878567. The next prime is 111668878661. The reversal of 111668878613 is 316878866111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106825692964 + 4843185649 = 326842^2 + 69593^2 .

It is a cyclic number.

It is not a de Polignac number, because 111668878613 - 2¹⁰ = 111668877589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111668878813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55834439306 + 55834439307.

It is an arithmetic number, because the mean of its divisors is an integer number (55834439307).

Almost surely, 2^111668878613 is an apocalyptic number.

It is an amenable number.

111668878613 is a deficient number, since it is larger than the sum of its proper divisors (1).

111668878613 is an equidigital number, since it uses as much as digits as its factorization.

111668878613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 56.

The spelling of 111668878613 in words is "one hundred eleven billion, six hundred sixty-eight million, eight hundred seventy-eight thousand, six hundred thirteen".