78298322009 has 2 divisors, whose sum is σ = 78298322010. Its totient is φ = 78298322008.

The previous prime is 78298321939. The next prime is 78298322017. The reversal of 78298322009 is 90022389287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75544171609 + 2754150400 = 274853^2 + 52480^2 .

It is a cyclic number.

It is not a de Polignac number, because 78298322009 - 2²⁸ = 78029886553 is a prime.

It is a super-2 number, since 2×78298322009² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78298322909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39149161004 + 39149161005.

It is an arithmetic number, because the mean of its divisors is an integer number (39149161005).

Almost surely, 2^78298322009 is an apocalyptic number.

It is an amenable number.

78298322009 is a deficient number, since it is larger than the sum of its proper divisors (1).

78298322009 is an equidigital number, since it uses as much as digits as its factorization.

78298322009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 78298322009 in words is "seventy-eight billion, two hundred ninety-eight million, three hundred twenty-two thousand, nine".