78433440218689 has 2 divisors, whose sum is σ = 78433440218690. Its totient is φ = 78433440218688.

The previous prime is 78433440218669. The next prime is 78433440218701. The reversal of 78433440218689 is 98681204433487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57961073089089 + 20472367129600 = 7613217^2 + 4524640^2 .

It is a cyclic number.

It is not a de Polignac number, because 78433440218689 - 2¹³ = 78433440210497 is a prime.

It is a super-2 number, since 2×78433440218689² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78433440218669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39216720109344 + 39216720109345.

It is an arithmetic number, because the mean of its divisors is an integer number (39216720109345).

Almost surely, 2^{78433440218689} is an apocalyptic number.

It is an amenable number.

78433440218689 is a deficient number, since it is larger than the sum of its proper divisors (1).

78433440218689 is an equidigital number, since it uses as much as digits as its factorization.

78433440218689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 222953472, while the sum is 67.

The spelling of 78433440218689 in words is "seventy-eight trillion, four hundred thirty-three billion, four hundred forty million, two hundred eighteen thousand, six hundred eighty-nine".