63780535052921 has 2 divisors, whose sum is σ = 63780535052922. Its totient is φ = 63780535052920.

The previous prime is 63780535052813. The next prime is 63780535052953. The reversal of 63780535052921 is 12925053508736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60148385180521 + 3632149872400 = 7755539^2 + 1905820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63780535052921 is a prime.

It is not a weakly prime, because it can be changed into another prime (63780535052981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31890267526460 + 31890267526461.

It is an arithmetic number, because the mean of its divisors is an integer number (31890267526461).

Almost surely, 2^{63780535052921} is an apocalyptic number.

It is an amenable number.

63780535052921 is a deficient number, since it is larger than the sum of its proper divisors (1).

63780535052921 is an equidigital number, since it uses as much as digits as its factorization.

63780535052921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608000, while the sum is 56.

The spelling of 63780535052921 in words is "sixty-three trillion, seven hundred eighty billion, five hundred thirty-five million, fifty-two thousand, nine hundred twenty-one".