7807878610561 has 2 divisors, whose sum is σ = 7807878610562. Its totient is φ = 7807878610560.

The previous prime is 7807878610471. The next prime is 7807878610583. The reversal of 7807878610561 is 1650168787087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7372615145536 + 435263465025 = 2715256^2 + 659745^2 .

It is a cyclic number.

It is not a de Polignac number, because 7807878610561 - 2¹³ = 7807878602369 is a prime.

It is a super-3 number, since 3×7807878610561³ (a number of 40 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7807878610493 and 7807878610502.

It is not a weakly prime, because it can be changed into another prime (7807878614561) 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 as a sum of consecutive naturals, namely, 3903939305280 + 3903939305281.

It is an arithmetic number, because the mean of its divisors is an integer number (3903939305281).

Almost surely, 2^{7807878610561} is an apocalyptic number.

It is an amenable number.

7807878610561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7807878610561 is an equidigital number, since it uses as much as digits as its factorization.

7807878610561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31610880, while the sum is 64.

The spelling of 7807878610561 in words is "seven trillion, eight hundred seven billion, eight hundred seventy-eight million, six hundred ten thousand, five hundred sixty-one".