215366320991 has 2 divisors, whose sum is σ = 215366320992. Its totient is φ = 215366320990.

The previous prime is 215366320943. The next prime is 215366321029. The reversal of 215366320991 is 199023663512.

215366320991 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 215366320991 - 2¹⁴ = 215366304607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215366320691) 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, 107683160495 + 107683160496.

It is an arithmetic number, because the mean of its divisors is an integer number (107683160496).

Almost surely, 2^215366320991 is an apocalyptic number.

215366320991 is a deficient number, since it is larger than the sum of its proper divisors (1).

215366320991 is an equidigital number, since it uses as much as digits as its factorization.

215366320991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 47.

The spelling of 215366320991 in words is "two hundred fifteen billion, three hundred sixty-six million, three hundred twenty thousand, nine hundred ninety-one".