200644878457 has 2 divisors, whose sum is σ = 200644878458. Its totient is φ = 200644878456.

The previous prime is 200644878433. The next prime is 200644878503. The reversal of 200644878457 is 754878446002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115565322601 + 85079555856 = 339949^2 + 291684^2 .

It is a cyclic number.

It is not a de Polignac number, because 200644878457 - 2²⁷ = 200510660729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200644878398 and 200644878407.

It is not a weakly prime, because it can be changed into another prime (200644878407) 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, 100322439228 + 100322439229.

It is an arithmetic number, because the mean of its divisors is an integer number (100322439229).

Almost surely, 2^200644878457 is an apocalyptic number.

It is an amenable number.

200644878457 is a deficient number, since it is larger than the sum of its proper divisors (1).

200644878457 is an equidigital number, since it uses as much as digits as its factorization.

200644878457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12042240, while the sum is 55.

The spelling of 200644878457 in words is "two hundred billion, six hundred forty-four million, eight hundred seventy-eight thousand, four hundred fifty-seven".