63889425649 has 4 divisors (see below), whose sum is σ = 73016486464. Its totient is φ = 54762364836.

The previous prime is 63889425643. The next prime is 63889425661. The reversal of 63889425649 is 94652498836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63889425649 - 2²¹ = 63887328497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63889425643) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4563530397 + ... + 4563530410.

It is an arithmetic number, because the mean of its divisors is an integer number (18254121616).

Almost surely, 2^63889425649 is an apocalyptic number.

It is an amenable number.

63889425649 is a deficient number, since it is larger than the sum of its proper divisors (9127060815).

63889425649 is an equidigital number, since it uses as much as digits as its factorization.

63889425649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9127060814.

The product of its digits is 89579520, while the sum is 64.

The spelling of 63889425649 in words is "sixty-three billion, eight hundred eighty-nine million, four hundred twenty-five thousand, six hundred forty-nine".