78216325405243 has 2 divisors, whose sum is σ = 78216325405244. Its totient is φ = 78216325405242.

The previous prime is 78216325405199. The next prime is 78216325405261. The reversal of 78216325405243 is 34250452361287.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78216325405243 - 2²⁵ = 78216291850811 is a prime.

It is a super-2 number, since 2×78216325405243² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78216325205243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39108162702621 + 39108162702622.

It is an arithmetic number, because the mean of its divisors is an integer number (39108162702622).

Almost surely, 2^{78216325405243} is an apocalyptic number.

78216325405243 is a deficient number, since it is larger than the sum of its proper divisors (1).

78216325405243 is an equidigital number, since it uses as much as digits as its factorization.

78216325405243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9676800, while the sum is 52.

The spelling of 78216325405243 in words is "seventy-eight trillion, two hundred sixteen billion, three hundred twenty-five million, four hundred five thousand, two hundred forty-three".