78265169 has 2 divisors, whose sum is σ = 78265170. Its totient is φ = 78265168.

The previous prime is 78265157. The next prime is 78265177. The reversal of 78265169 is 96156287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53114944 + 25150225 = 7288^2 + 5015^2 .

It is a cyclic number.

It is not a de Polignac number, because 78265169 - 2²⁰ = 77216593 is a prime.

It is a super-2 number, since 2×78265169² = 12250873357197122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78265139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39132584 + 39132585.

It is an arithmetic number, because the mean of its divisors is an integer number (39132585).

Almost surely, 2^78265169 is an apocalyptic number.

It is an amenable number.

78265169 is a deficient number, since it is larger than the sum of its proper divisors (1).

78265169 is an equidigital number, since it uses as much as digits as its factorization.

78265169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 78265169 is about 8846.7603675018. The cubic root of 78265169 is about 427.7494985797.

The spelling of 78265169 in words is "seventy-eight million, two hundred sixty-five thousand, one hundred sixty-nine".