78242756858753 has 8 divisors (see below), whose sum is σ = 78344375748456. Its totient is φ = 78141153340800.

The previous prime is 78242756858731. The next prime is 78242756858789. The reversal of 78242756858753 is 35785865724287.

It can be written as a sum of positive squares in 4 ways, for example, as 22863813318544 + 55378943540209 = 4781612^2 + 7441703^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78242756858753 - 2⁴⁰ = 77143245230977 is a prime.

It is a super-2 number, since 2×78242756858753² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78242756858713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6361325 + ... + 14033957.

It is an arithmetic number, because the mean of its divisors is an integer number (9793046968557).

Almost surely, 2^{78242756858753} is an apocalyptic number.

It is an amenable number.

78242756858753 is a deficient number, since it is larger than the sum of its proper divisors (101618889703).

78242756858753 is a wasteful number, since it uses less digits than its factorization.

78242756858753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7685875.

The product of its digits is 6322176000, while the sum is 77.

The spelling of 78242756858753 in words is "seventy-eight trillion, two hundred forty-two billion, seven hundred fifty-six million, eight hundred fifty-eight thousand, seven hundred fifty-three".