63906373913 has 2 divisors, whose sum is σ = 63906373914. Its totient is φ = 63906373912.

The previous prime is 63906373891. The next prime is 63906373957. The reversal of 63906373913 is 31937360936.

It is a happy number.

63906373913 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., 54939609664 + 8966764249 = 234392^2 + 94693^2 .

It is a cyclic number.

It is not a de Polignac number, because 63906373913 - 2⁶ = 63906373849 is a prime.

It is not a weakly prime, because it can be changed into another prime (63906393913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31953186956 + 31953186957.

It is an arithmetic number, because the mean of its divisors is an integer number (31953186957).

Almost surely, 2^63906373913 is an apocalyptic number.

It is an amenable number.

63906373913 is a deficient number, since it is larger than the sum of its proper divisors (1).

63906373913 is an equidigital number, since it uses as much as digits as its factorization.

63906373913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1653372, while the sum is 50.

The spelling of 63906373913 in words is "sixty-three billion, nine hundred six million, three hundred seventy-three thousand, nine hundred thirteen".