111639868019 has 2 divisors, whose sum is σ = 111639868020. Its totient is φ = 111639868018.

The previous prime is 111639868007. The next prime is 111639868049. The reversal of 111639868019 is 910868936111.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111639868019 is a prime.

It is a super-2 number, since 2×111639868019² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (111639868049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55819934009 + 55819934010.

It is an arithmetic number, because the mean of its divisors is an integer number (55819934010).

Almost surely, 2^111639868019 is an apocalyptic number.

111639868019 is a deficient number, since it is larger than the sum of its proper divisors (1).

111639868019 is an equidigital number, since it uses as much as digits as its factorization.

111639868019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 53.

The spelling of 111639868019 in words is "one hundred eleven billion, six hundred thirty-nine million, eight hundred sixty-eight thousand, nineteen".