78315619489 has 2 divisors, whose sum is σ = 78315619490. Its totient is φ = 78315619488.

The previous prime is 78315619457. The next prime is 78315619507. The reversal of 78315619489 is 98491651387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62846478864 + 15469140625 = 250692^2 + 124375^2 .

It is a cyclic number.

It is not a de Polignac number, because 78315619489 - 2⁵ = 78315619457 is a prime.

It is a super-2 number, since 2×78315619489² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78315619289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39157809744 + 39157809745.

It is an arithmetic number, because the mean of its divisors is an integer number (39157809745).

Almost surely, 2^78315619489 is an apocalyptic number.

It is an amenable number.

78315619489 is a deficient number, since it is larger than the sum of its proper divisors (1).

78315619489 is an equidigital number, since it uses as much as digits as its factorization.

78315619489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 61.

The spelling of 78315619489 in words is "seventy-eight billion, three hundred fifteen million, six hundred nineteen thousand, four hundred eighty-nine".