78558621247 has 2 divisors, whose sum is σ = 78558621248. Its totient is φ = 78558621246.

The previous prime is 78558621209. The next prime is 78558621289. The reversal of 78558621247 is 74212685587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78558621247 - 2²³ = 78550232639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78558621847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39279310623 + 39279310624.

It is an arithmetic number, because the mean of its divisors is an integer number (39279310624).

Almost surely, 2^78558621247 is an apocalyptic number.

78558621247 is a deficient number, since it is larger than the sum of its proper divisors (1).

78558621247 is an equidigital number, since it uses as much as digits as its factorization.

78558621247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7526400, while the sum is 55.

The spelling of 78558621247 in words is "seventy-eight billion, five hundred fifty-eight million, six hundred twenty-one thousand, two hundred forty-seven".