216378794347 has 2 divisors, whose sum is σ = 216378794348. Its totient is φ = 216378794346.

The previous prime is 216378794327. The next prime is 216378794353. The reversal of 216378794347 is 743497873612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216378794347 is a prime.

It is a super-2 number, since 2×216378794347² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216378794327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108189397173 + 108189397174.

It is an arithmetic number, because the mean of its divisors is an integer number (108189397174).

Almost surely, 2^216378794347 is an apocalyptic number.

216378794347 is a deficient number, since it is larger than the sum of its proper divisors (1).

216378794347 is an equidigital number, since it uses as much as digits as its factorization.

216378794347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42674688, while the sum is 61.

The spelling of 216378794347 in words is "two hundred sixteen billion, three hundred seventy-eight million, seven hundred ninety-four thousand, three hundred forty-seven".