216603433979 has 2 divisors, whose sum is σ = 216603433980. Its totient is φ = 216603433978.

The previous prime is 216603433951. The next prime is 216603434027. The reversal of 216603433979 is 979334306612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216603433979 - 2¹² = 216603429883 is a prime.

It is a super-2 number, since 2×216603433979² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216603433979.

It is not a weakly prime, because it can be changed into another prime (216603433279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108301716989 + 108301716990.

It is an arithmetic number, because the mean of its divisors is an integer number (108301716990).

Almost surely, 2^216603433979 is an apocalyptic number.

216603433979 is a deficient number, since it is larger than the sum of its proper divisors (1).

216603433979 is an equidigital number, since it uses as much as digits as its factorization.

216603433979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4408992, while the sum is 53.

The spelling of 216603433979 in words is "two hundred sixteen billion, six hundred three million, four hundred thirty-three thousand, nine hundred seventy-nine".