63778625732441 has 2 divisors, whose sum is σ = 63778625732442. Its totient is φ = 63778625732440.

The previous prime is 63778625732411. The next prime is 63778625732443. The reversal of 63778625732441 is 14423752687736.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50470510147600 + 13308115584841 = 7104260^2 + 3648029^2 .

It is a cyclic number.

It is not a de Polignac number, because 63778625732441 - 2⁶ = 63778625732377 is a prime.

It is a Sophie Germain prime.

Together with 63778625732443, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (63778625732443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31889312866220 + 31889312866221.

It is an arithmetic number, because the mean of its divisors is an integer number (31889312866221).

Almost surely, 2^{63778625732441} is an apocalyptic number.

It is an amenable number.

63778625732441 is a deficient number, since it is larger than the sum of its proper divisors (1).

63778625732441 is an equidigital number, since it uses as much as digits as its factorization.

63778625732441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 284497920, while the sum is 65.

The spelling of 63778625732441 in words is "sixty-three trillion, seven hundred seventy-eight billion, six hundred twenty-five million, seven hundred thirty-two thousand, four hundred forty-one".