78717977753 has 2 divisors, whose sum is σ = 78717977754. Its totient is φ = 78717977752.

The previous prime is 78717977731. The next prime is 78717977827. The reversal of 78717977753 is 35777971787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65965244569 + 12752733184 = 256837^2 + 112928^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78717977753 is a prime.

It is a super-3 number, since 3×78717977753³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (78717977713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39358988876 + 39358988877.

It is an arithmetic number, because the mean of its divisors is an integer number (39358988877).

Almost surely, 2^78717977753 is an apocalyptic number.

It is an amenable number.

78717977753 is a deficient number, since it is larger than the sum of its proper divisors (1).

78717977753 is an equidigital number, since it uses as much as digits as its factorization.

78717977753 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127060920, while the sum is 68.

The spelling of 78717977753 in words is "seventy-eight billion, seven hundred seventeen million, nine hundred seventy-seven thousand, seven hundred fifty-three".