78190051349 has 2 divisors, whose sum is σ = 78190051350. Its totient is φ = 78190051348.

The previous prime is 78190051339. The next prime is 78190051361. The reversal of 78190051349 is 94315009187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61372630225 + 16817421124 = 247735^2 + 129682^2 .

It is a cyclic number.

It is not a de Polignac number, because 78190051349 - 2⁴ = 78190051333 is a prime.

It is a super-2 number, since 2×78190051349² (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 (78190051339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39095025674 + 39095025675.

It is an arithmetic number, because the mean of its divisors is an integer number (39095025675).

Almost surely, 2^78190051349 is an apocalyptic number.

It is an amenable number.

78190051349 is a deficient number, since it is larger than the sum of its proper divisors (1).

78190051349 is an equidigital number, since it uses as much as digits as its factorization.

78190051349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 78190051349 in words is "seventy-eight billion, one hundred ninety million, fifty-one thousand, three hundred forty-nine".