78972558317 has 2 divisors, whose sum is σ = 78972558318. Its totient is φ = 78972558316.

The previous prime is 78972558307. The next prime is 78972558361. The reversal of 78972558317 is 71385527987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53811936676 + 25160621641 = 231974^2 + 158621^2 .

It is a cyclic number.

It is not a de Polignac number, because 78972558317 - 2⁶ = 78972558253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78972558317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78972558307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39486279158 + 39486279159.

It is an arithmetic number, because the mean of its divisors is an integer number (39486279159).

Almost surely, 2^78972558317 is an apocalyptic number.

It is an amenable number.

78972558317 is a deficient number, since it is larger than the sum of its proper divisors (1).

78972558317 is an equidigital number, since it uses as much as digits as its factorization.

78972558317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29635200, while the sum is 62.

The spelling of 78972558317 in words is "seventy-eight billion, nine hundred seventy-two million, five hundred fifty-eight thousand, three hundred seventeen".