78274839647 has 2 divisors, whose sum is σ = 78274839648. Its totient is φ = 78274839646.

The previous prime is 78274839613. The next prime is 78274839679. The reversal of 78274839647 is 74693847287.

It is a strong prime.

It is an emirp because it is prime and its reverse (74693847287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78274839647 - 2⁶ = 78274839583 is a prime.

It is a super-2 number, since 2×78274839647² (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 (78274239647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39137419823 + 39137419824.

It is an arithmetic number, because the mean of its divisors is an integer number (39137419824).

Almost surely, 2^78274839647 is an apocalyptic number.

78274839647 is a deficient number, since it is larger than the sum of its proper divisors (1).

78274839647 is an equidigital number, since it uses as much as digits as its factorization.

78274839647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113799168, while the sum is 65.

The spelling of 78274839647 in words is "seventy-eight billion, two hundred seventy-four million, eight hundred thirty-nine thousand, six hundred forty-seven".