78754493717 has 2 divisors, whose sum is σ = 78754493718. Its totient is φ = 78754493716.

The previous prime is 78754493681. The next prime is 78754493723. The reversal of 78754493717 is 71739445787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64520572081 + 14233921636 = 254009^2 + 119306^2 .

It is an emirp because it is prime and its reverse (71739445787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78754493717 - 2²² = 78750299413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78754493717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78754493737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39377246858 + 39377246859.

It is an arithmetic number, because the mean of its divisors is an integer number (39377246859).

Almost surely, 2^78754493717 is an apocalyptic number.

It is an amenable number.

78754493717 is a deficient number, since it is larger than the sum of its proper divisors (1).

78754493717 is an equidigital number, since it uses as much as digits as its factorization.

78754493717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41489280, while the sum is 62.

The spelling of 78754493717 in words is "seventy-eight billion, seven hundred fifty-four million, four hundred ninety-three thousand, seven hundred seventeen".