78218582513251 has 2 divisors, whose sum is σ = 78218582513252. Its totient is φ = 78218582513250.

The previous prime is 78218582513233. The next prime is 78218582513287. The reversal of 78218582513251 is 15231528581287.

It is a weak prime.

It is an emirp because it is prime and its reverse (15231528581287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78218582513251 - 2⁹ = 78218582512739 is a prime.

It is a super-3 number, since 3×78218582513251³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (78218582516251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39109291256625 + 39109291256626.

It is an arithmetic number, because the mean of its divisors is an integer number (39109291256626).

Almost surely, 2^{78218582513251} is an apocalyptic number.

78218582513251 is a deficient number, since it is larger than the sum of its proper divisors (1).

78218582513251 is an equidigital number, since it uses as much as digits as its factorization.

78218582513251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752000, while the sum is 58.

The spelling of 78218582513251 in words is "seventy-eight trillion, two hundred eighteen billion, five hundred eighty-two million, five hundred thirteen thousand, two hundred fifty-one".