7568278081321 has 4 divisors (see below), whose sum is σ = 8013470909652. Its totient is φ = 7123085252992.

The previous prime is 7568278081307. The next prime is 7568278081379. The reversal of 7568278081321 is 1231808728657.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2833145408025 + 4735132673296 = 1683195^2 + 2176036^2 .

It is a cyclic number.

It is not a de Polignac number, because 7568278081321 - 2⁷ = 7568278081193 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7568278081121) 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 in 3 ways as a sum of consecutive naturals, for example, 222596414140 + ... + 222596414173.

It is an arithmetic number, because the mean of its divisors is an integer number (2003367727413).

Almost surely, 2^{7568278081321} is an apocalyptic number.

It is an amenable number.

7568278081321 is a deficient number, since it is larger than the sum of its proper divisors (445192828331).

7568278081321 is a wasteful number, since it uses less digits than its factorization.

7568278081321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445192828330.

The product of its (nonzero) digits is 9031680, while the sum is 58.

The spelling of 7568278081321 in words is "seven trillion, five hundred sixty-eight billion, two hundred seventy-eight million, eighty-one thousand, three hundred twenty-one".