783221806361 has 2 divisors, whose sum is σ = 783221806362. Its totient is φ = 783221806360.

The previous prime is 783221806351. The next prime is 783221806421. The reversal of 783221806361 is 163608122387.

783221806361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 756212856025 + 27008950336 = 869605^2 + 164344^2 .

It is a cyclic number.

It is not a de Polignac number, because 783221806361 - 2³⁸ = 508343899417 is a prime.

It is a super-2 number, since 2×783221806361² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (783221806351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391610903180 + 391610903181.

It is an arithmetic number, because the mean of its divisors is an integer number (391610903181).

Almost surely, 2^783221806361 is an apocalyptic number.

It is an amenable number.

783221806361 is a deficient number, since it is larger than the sum of its proper divisors (1).

783221806361 is an equidigital number, since it uses as much as digits as its factorization.

783221806361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 783221806361 in words is "seven hundred eighty-three billion, two hundred twenty-one million, eight hundred six thousand, three hundred sixty-one".