78568439565456 has 105 divisors (see below), whose sum is σ = 228237900751849. Its totient is φ = 26189160755328.

The previous prime is 78568439565437. The next prime is 78568439565457. The reversal of 78568439565456 is 65456593486587.

The square root of 78568439565456 is 8863884.

It is a perfect power (a square), and thus also a powerful number.

78568439565456 is a `hidden beast` number, since 7 + 8 + 5 + 6 + 8 + 4 + 3 + 9 + 565 + 45 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 231495699600 + 78336943865856 = 481140^2 + 8850816^2 .

It is a super-2 number, since 2×78568439565456² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78568439565457) 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 20 ways as a sum of consecutive naturals, for example, 957258436 + ... + 957340508.

Almost surely, 2^{78568439565456} is an apocalyptic number.

78568439565456 is the 8863884-th square number.

It is an amenable number.

78568439565456 is an abundant number, since it is smaller than the sum of its proper divisors (149669461186393).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78568439565456 is an frugal number, since it uses more digits than its factorization.

78568439565456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164172 (or 82078 counting only the distinct ones).

The product of its digits is 26127360000, while the sum is 81.

78568439565456 divided by its sum of digits (81) gives a square (969980735376 = 984876²).

The spelling of 78568439565456 in words is "seventy-eight trillion, five hundred sixty-eight billion, four hundred thirty-nine million, five hundred sixty-five thousand, four hundred fifty-six".