78530856221413 has 2 divisors, whose sum is σ = 78530856221414. Its totient is φ = 78530856221412.

The previous prime is 78530856221347. The next prime is 78530856221443. The reversal of 78530856221413 is 31412265803587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74098387073764 + 4432469147649 = 8608042^2 + 2105343^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78530856221413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78530856221443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39265428110706 + 39265428110707.

It is an arithmetic number, because the mean of its divisors is an integer number (39265428110707).

Almost surely, 2^{78530856221413} is an apocalyptic number.

It is an amenable number.

78530856221413 is a deficient number, since it is larger than the sum of its proper divisors (1).

78530856221413 is an equidigital number, since it uses as much as digits as its factorization.

78530856221413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9676800, while the sum is 55.

The spelling of 78530856221413 in words is "seventy-eight trillion, five hundred thirty billion, eight hundred fifty-six million, two hundred twenty-one thousand, four hundred thirteen".