78347974493 has 2 divisors, whose sum is σ = 78347974494. Its totient is φ = 78347974492.

The previous prime is 78347974361. The next prime is 78347974519. The reversal of 78347974493 is 39447974387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44393647204 + 33954327289 = 210698^2 + 184267^2 .

It is an emirp because it is prime and its reverse (39447974387) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78347974493 is a prime.

It is a super-2 number, since 2×78347974493² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78347974193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39173987246 + 39173987247.

It is an arithmetic number, because the mean of its divisors is an integer number (39173987247).

Almost surely, 2^78347974493 is an apocalyptic number.

It is an amenable number.

78347974493 is a deficient number, since it is larger than the sum of its proper divisors (1).

78347974493 is an equidigital number, since it uses as much as digits as its factorization.

78347974493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128024064, while the sum is 65.

The spelling of 78347974493 in words is "seventy-eight billion, three hundred forty-seven million, nine hundred seventy-four thousand, four hundred ninety-three".