78362215409 has 2 divisors, whose sum is σ = 78362215410. Its totient is φ = 78362215408.

The previous prime is 78362215403. The next prime is 78362215417. The reversal of 78362215409 is 90451226387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43920423184 + 34441792225 = 209572^2 + 185585^2 .

It is a cyclic number.

It is not a de Polignac number, because 78362215409 - 2⁸ = 78362215153 is a prime.

It is a super-2 number, since 2×78362215409² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78362215403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39181107704 + 39181107705.

It is an arithmetic number, because the mean of its divisors is an integer number (39181107705).

It is a 1-persistent number, because it is pandigital, but 2⋅78362215409 = 156724430818 is not.

Almost surely, 2^78362215409 is an apocalyptic number.

It is an amenable number.

78362215409 is a deficient number, since it is larger than the sum of its proper divisors (1).

78362215409 is an equidigital number, since it uses as much as digits as its factorization.

78362215409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 78362215409 in words is "seventy-eight billion, three hundred sixty-two million, two hundred fifteen thousand, four hundred nine".