63475855857481 has 2 divisors, whose sum is σ = 63475855857482. Its totient is φ = 63475855857480.

The previous prime is 63475855857397. The next prime is 63475855857487. The reversal of 63475855857481 is 18475855857436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34552541615881 + 28923314241600 = 5878141^2 + 5378040^2 .

It is a cyclic number.

It is not a de Polignac number, because 63475855857481 - 2⁹ = 63475855856969 is a prime.

It is a super-2 number, since 2×63475855857481² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 63475855857398 and 63475855857407.

It is not a weakly prime, because it can be changed into another prime (63475855857487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31737927928740 + 31737927928741.

It is an arithmetic number, because the mean of its divisors is an integer number (31737927928741).

Almost surely, 2^{63475855857481} is an apocalyptic number.

It is an amenable number.

63475855857481 is a deficient number, since it is larger than the sum of its proper divisors (1).

63475855857481 is an equidigital number, since it uses as much as digits as its factorization.

63475855857481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840000, while the sum is 76.

The spelling of 63475855857481 in words is "sixty-three trillion, four hundred seventy-five billion, eight hundred fifty-five million, eight hundred fifty-seven thousand, four hundred eighty-one".