215411511911 has 2 divisors, whose sum is σ = 215411511912. Its totient is φ = 215411511910.

The previous prime is 215411511893. The next prime is 215411511923. The reversal of 215411511911 is 119115114512.

215411511911 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 a de Polignac number, because none of the positive numbers 2^k-215411511911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215411510911) 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, 107705755955 + 107705755956.

It is an arithmetic number, because the mean of its divisors is an integer number (107705755956).

Almost surely, 2^215411511911 is an apocalyptic number.

215411511911 is a deficient number, since it is larger than the sum of its proper divisors (1).

215411511911 is an equidigital number, since it uses as much as digits as its factorization.

215411511911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 32.

The spelling of 215411511911 in words is "two hundred fifteen billion, four hundred eleven million, five hundred eleven thousand, nine hundred eleven".