78368276009 has 2 divisors, whose sum is σ = 78368276010. Its totient is φ = 78368276008.

The previous prime is 78368275967. The next prime is 78368276017. The reversal of 78368276009 is 90067286387.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47794704400 + 30573571609 = 218620^2 + 174853^2 .

It is a cyclic number.

It is not a de Polignac number, because 78368276009 - 2³² = 74073308713 is a prime.

It is a super-2 number, since 2×78368276009² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78368276029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39184138004 + 39184138005.

It is an arithmetic number, because the mean of its divisors is an integer number (39184138005).

Almost surely, 2^78368276009 is an apocalyptic number.

It is an amenable number.

78368276009 is a deficient number, since it is larger than the sum of its proper divisors (1).

78368276009 is an equidigital number, since it uses as much as digits as its factorization.

78368276009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 78368276009 in words is "seventy-eight billion, three hundred sixty-eight million, two hundred seventy-six thousand, nine".