78680258786513 has 2 divisors, whose sum is σ = 78680258786514. Its totient is φ = 78680258786512.

The previous prime is 78680258786497. The next prime is 78680258786539. The reversal of 78680258786513 is 31568785208687.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75194166502849 + 3486092283664 = 8671457^2 + 1867108^2 .

It is a cyclic number.

It is not a de Polignac number, because 78680258786513 - 2⁴ = 78680258786497 is a prime.

It is a super-2 number, since 2×78680258786513² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78680258786593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39340129393256 + 39340129393257.

It is an arithmetic number, because the mean of its divisors is an integer number (39340129393257).

Almost surely, 2^{78680258786513} is an apocalyptic number.

It is an amenable number.

78680258786513 is a deficient number, since it is larger than the sum of its proper divisors (1).

78680258786513 is an equidigital number, since it uses as much as digits as its factorization.

78680258786513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1083801600, while the sum is 74.

The spelling of 78680258786513 in words is "seventy-eight trillion, six hundred eighty billion, two hundred fifty-eight million, seven hundred eighty-six thousand, five hundred thirteen".