63440618473 has 2 divisors, whose sum is σ = 63440618474. Its totient is φ = 63440618472.

The previous prime is 63440618447. The next prime is 63440618533. The reversal of 63440618473 is 37481604436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48800344464 + 14640274009 = 220908^2 + 120997^2 .

It is a cyclic number.

It is not a de Polignac number, because 63440618473 - 2⁵ = 63440618441 is a prime.

It is not a weakly prime, because it can be changed into another prime (63440618413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31720309236 + 31720309237.

It is an arithmetic number, because the mean of its divisors is an integer number (31720309237).

Almost surely, 2^63440618473 is an apocalyptic number.

It is an amenable number.

63440618473 is a deficient number, since it is larger than the sum of its proper divisors (1).

63440618473 is an equidigital number, since it uses as much as digits as its factorization.

63440618473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 46.

The spelling of 63440618473 in words is "sixty-three billion, four hundred forty million, six hundred eighteen thousand, four hundred seventy-three".