78472338784547 has 2 divisors, whose sum is σ = 78472338784548. Its totient is φ = 78472338784546.

The previous prime is 78472338784507. The next prime is 78472338784549. The reversal of 78472338784547 is 74548783327487.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78472338784547 is a prime.

Together with 78472338784549, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78472338784549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39236169392273 + 39236169392274.

It is an arithmetic number, because the mean of its divisors is an integer number (39236169392274).

Almost surely, 2^{78472338784547} is an apocalyptic number.

78472338784547 is a deficient number, since it is larger than the sum of its proper divisors (1).

78472338784547 is an equidigital number, since it uses as much as digits as its factorization.

78472338784547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7080837120, while the sum is 77.

The spelling of 78472338784547 in words is "seventy-eight trillion, four hundred seventy-two billion, three hundred thirty-eight million, seven hundred eighty-four thousand, five hundred forty-seven".