78134380393 has 2 divisors, whose sum is σ = 78134380394. Its totient is φ = 78134380392.

The previous prime is 78134380367. The next prime is 78134380403. The reversal of 78134380393 is 39308343187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64843057449 + 13291322944 = 254643^2 + 115288^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78134380393 is a prime.

It is a super-2 number, since 2×78134380393² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78134180393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39067190196 + 39067190197.

It is an arithmetic number, because the mean of its divisors is an integer number (39067190197).

Almost surely, 2^78134380393 is an apocalyptic number.

It is an amenable number.

78134380393 is a deficient number, since it is larger than the sum of its proper divisors (1).

78134380393 is an equidigital number, since it uses as much as digits as its factorization.

78134380393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 78134380393 in words is "seventy-eight billion, one hundred thirty-four million, three hundred eighty thousand, three hundred ninety-three".