78300821519 has 2 divisors, whose sum is σ = 78300821520. Its totient is φ = 78300821518.

The previous prime is 78300821513. The next prime is 78300821527. The reversal of 78300821519 is 91512800387.

It is a weak prime.

It is an emirp because it is prime and its reverse (91512800387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78300821519 - 2³⁶ = 9581344783 is a prime.

It is a super-2 number, since 2×78300821519² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78300821519.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78300821513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39150410759 + 39150410760.

It is an arithmetic number, because the mean of its divisors is an integer number (39150410760).

Almost surely, 2^78300821519 is an apocalyptic number.

78300821519 is a deficient number, since it is larger than the sum of its proper divisors (1).

78300821519 is an equidigital number, since it uses as much as digits as its factorization.

78300821519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 78300821519 in words is "seventy-eight billion, three hundred million, eight hundred twenty-one thousand, five hundred nineteen".