63780801673 has 2 divisors, whose sum is σ = 63780801674. Its totient is φ = 63780801672.

The previous prime is 63780801631. The next prime is 63780801697. The reversal of 63780801673 is 37610808736.

63780801673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57832073289 + 5948728384 = 240483^2 + 77128^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63780801673 is a prime.

It is not a weakly prime, because it can be changed into another prime (63780801173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31890400836 + 31890400837.

It is an arithmetic number, because the mean of its divisors is an integer number (31890400837).

Almost surely, 2^63780801673 is an apocalyptic number.

It is an amenable number.

63780801673 is a deficient number, since it is larger than the sum of its proper divisors (1).

63780801673 is an equidigital number, since it uses as much as digits as its factorization.

63780801673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The spelling of 63780801673 in words is "sixty-three billion, seven hundred eighty million, eight hundred one thousand, six hundred seventy-three".