43156661111 has 2 divisors, whose sum is σ = 43156661112. Its totient is φ = 43156661110.

The previous prime is 43156661101. The next prime is 43156661113. The reversal of 43156661111 is 11116665134.

43156661111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43156661111 - 2³⁰ = 42082919287 is a prime.

It is a Sophie Germain prime.

Together with 43156661113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43156661113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21578330555 + 21578330556.

It is an arithmetic number, because the mean of its divisors is an integer number (21578330556).

Almost surely, 2^43156661111 is an apocalyptic number.

43156661111 is a deficient number, since it is larger than the sum of its proper divisors (1).

43156661111 is an equidigital number, since it uses as much as digits as its factorization.

43156661111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The spelling of 43156661111 in words is "forty-three billion, one hundred fifty-six million, six hundred sixty-one thousand, one hundred eleven".