78393185249 has 2 divisors, whose sum is σ = 78393185250. Its totient is φ = 78393185248.

The previous prime is 78393185243. The next prime is 78393185291. The reversal of 78393185249 is 94258139387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41277236224 + 37115949025 = 203168^2 + 192655^2 .

It is an emirp because it is prime and its reverse (94258139387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78393185249 - 2¹⁶ = 78393119713 is a prime.

It is a super-2 number, since 2×78393185249² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78393185243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39196592624 + 39196592625.

It is an arithmetic number, because the mean of its divisors is an integer number (39196592625).

Almost surely, 2^78393185249 is an apocalyptic number.

It is an amenable number.

78393185249 is a deficient number, since it is larger than the sum of its proper divisors (1).

78393185249 is an equidigital number, since it uses as much as digits as its factorization.

78393185249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 59.

The spelling of 78393185249 in words is "seventy-eight billion, three hundred ninety-three million, one hundred eighty-five thousand, two hundred forty-nine".