78432169811 has 2 divisors, whose sum is σ = 78432169812. Its totient is φ = 78432169810.

The previous prime is 78432169769. The next prime is 78432169813. The reversal of 78432169811 is 11896123487.

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-78432169811 is a prime.

It is a super-2 number, since 2×78432169811² (a number of 23 digits) contains 22 as substring.

Together with 78432169813, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78432169811.

It is not a weakly prime, because it can be changed into another prime (78432169813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39216084905 + 39216084906.

It is an arithmetic number, because the mean of its divisors is an integer number (39216084906).

Almost surely, 2^78432169811 is an apocalyptic number.

78432169811 is a deficient number, since it is larger than the sum of its proper divisors (1).

78432169811 is an equidigital number, since it uses as much as digits as its factorization.

78432169811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 50.

The spelling of 78432169811 in words is "seventy-eight billion, four hundred thirty-two million, one hundred sixty-nine thousand, eight hundred eleven".