63644684875 has 8 divisors (see below), whose sum is σ = 79428566880. Its totient is φ = 50915747800.

The previous prime is 63644684869. The next prime is 63644684897. The reversal of 63644684875 is 57848644636.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-63644684875 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254578615 + ... + 254578864.

It is an arithmetic number, because the mean of its divisors is an integer number (9928570860).

Almost surely, 2^63644684875 is an apocalyptic number.

63644684875 is a deficient number, since it is larger than the sum of its proper divisors (15783882005).

63644684875 is an equidigital number, since it uses as much as digits as its factorization.

63644684875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509157494 (or 509157484 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 61.

The spelling of 63644684875 in words is "sixty-three billion, six hundred forty-four million, six hundred eighty-four thousand, eight hundred seventy-five".