78345309293 has 2 divisors, whose sum is σ = 78345309294. Its totient is φ = 78345309292.

The previous prime is 78345309277. The next prime is 78345309337. The reversal of 78345309293 is 39290354387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76616579209 + 1728730084 = 276797^2 + 41578^2 .

It is a cyclic number.

It is not a de Polignac number, because 78345309293 - 2⁴ = 78345309277 is a prime.

It is a super-2 number, since 2×78345309293² (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 (78345309233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39172654646 + 39172654647.

It is an arithmetic number, because the mean of its divisors is an integer number (39172654647).

Almost surely, 2^78345309293 is an apocalyptic number.

It is an amenable number.

78345309293 is a deficient number, since it is larger than the sum of its proper divisors (1).

78345309293 is an equidigital number, since it uses as much as digits as its factorization.

78345309293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4898880, while the sum is 53.

The spelling of 78345309293 in words is "seventy-eight billion, three hundred forty-five million, three hundred nine thousand, two hundred ninety-three".