78347722247 has 2 divisors, whose sum is σ = 78347722248. Its totient is φ = 78347722246.

The previous prime is 78347722241. The next prime is 78347722357. The reversal of 78347722247 is 74222774387.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (74222774387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78347722247 - 2⁶ = 78347722183 is a prime.

It is a super-2 number, since 2×78347722247² (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 (78347722241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39173861123 + 39173861124.

It is an arithmetic number, because the mean of its divisors is an integer number (39173861124).

Almost surely, 2^78347722247 is an apocalyptic number.

78347722247 is a deficient number, since it is larger than the sum of its proper divisors (1).

78347722247 is an equidigital number, since it uses as much as digits as its factorization.

78347722247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7375872, while the sum is 53.

The spelling of 78347722247 in words is "seventy-eight billion, three hundred forty-seven million, seven hundred twenty-two thousand, two hundred forty-seven".