216576067381 has 2 divisors, whose sum is σ = 216576067382. Its totient is φ = 216576067380.

The previous prime is 216576067349. The next prime is 216576067403. The reversal of 216576067381 is 183760675612.

It is a happy number.

216576067381 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., 182699824356 + 33876243025 = 427434^2 + 184055^2 .

It is a cyclic number.

It is not a de Polignac number, because 216576067381 - 2⁵ = 216576067349 is a prime.

It is a super-2 number, since 2×216576067381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216576067681) 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, 108288033690 + 108288033691.

It is an arithmetic number, because the mean of its divisors is an integer number (108288033691).

Almost surely, 2^216576067381 is an apocalyptic number.

It is an amenable number.

216576067381 is a deficient number, since it is larger than the sum of its proper divisors (1).

216576067381 is an equidigital number, since it uses as much as digits as its factorization.

216576067381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 216576067381 in words is "two hundred sixteen billion, five hundred seventy-six million, sixty-seven thousand, three hundred eighty-one".