78298389349 has 2 divisors, whose sum is σ = 78298389350. Its totient is φ = 78298389348.

The previous prime is 78298389347. The next prime is 78298389361. The reversal of 78298389349 is 94398389287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64622724100 + 13675665249 = 254210^2 + 116943^2 .

It is a cyclic number.

It is not a de Polignac number, because 78298389349 - 2¹ = 78298389347 is a prime.

It is a super-3 number, since 3×78298389349³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 78298389347, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78298389343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39149194674 + 39149194675.

It is an arithmetic number, because the mean of its divisors is an integer number (39149194675).

Almost surely, 2^78298389349 is an apocalyptic number.

It is an amenable number.

78298389349 is a deficient number, since it is larger than the sum of its proper divisors (1).

78298389349 is an equidigital number, since it uses as much as digits as its factorization.

78298389349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188116992, while the sum is 70.

The spelling of 78298389349 in words is "seventy-eight billion, two hundred ninety-eight million, three hundred eighty-nine thousand, three hundred forty-nine".