63440618457 has 32 divisors (see below), whose sum is σ = 91466081280. Its totient is φ = 38992627520.

The previous prime is 63440618447. The next prime is 63440618473. The reversal of 63440618457 is 75481604436.

It is a cyclic number.

It is not a de Polignac number, because 63440618457 - 2⁴ = 63440618441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63440618407) 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 in 31 ways as a sum of consecutive naturals, for example, 1147582 + ... + 1201592.

It is an arithmetic number, because the mean of its divisors is an integer number (2858315040).

Almost surely, 2^63440618457 is an apocalyptic number.

It is an amenable number.

63440618457 is a deficient number, since it is larger than the sum of its proper divisors (28025462823).

63440618457 is a wasteful number, since it uses less digits than its factorization.

63440618457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54653.

The product of its (nonzero) digits is 1935360, while the sum is 48.

The spelling of 63440618457 in words is "sixty-three billion, four hundred forty million, six hundred eighteen thousand, four hundred fifty-seven".