218278155101 has 2 divisors, whose sum is σ = 218278155102. Its totient is φ = 218278155100.

The previous prime is 218278155061. The next prime is 218278155103. The reversal of 218278155101 is 101551872812.

It is a happy number.

218278155101 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 can be written as a sum of positive squares in only one way, i.e., 147378442201 + 70899712900 = 383899^2 + 266270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218278155101 is a prime.

Together with 218278155103, 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 (218278155103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109139077550 + 109139077551.

It is an arithmetic number, because the mean of its divisors is an integer number (109139077551).

Almost surely, 2^218278155101 is an apocalyptic number.

It is an amenable number.

218278155101 is a deficient number, since it is larger than the sum of its proper divisors (1).

218278155101 is an equidigital number, since it uses as much as digits as its factorization.

218278155101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44800, while the sum is 41.

The spelling of 218278155101 in words is "two hundred eighteen billion, two hundred seventy-eight million, one hundred fifty-five thousand, one hundred one".