63654683889 has 4 divisors (see below), whose sum is σ = 84872911856. Its totient is φ = 42436455924.

The previous prime is 63654683887. The next prime is 63654683909. The reversal of 63654683889 is 98838645636.

It is a happy number.

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 not a de Polignac number, because 63654683889 - 2¹ = 63654683887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63654683887) 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 3 ways as a sum of consecutive naturals, for example, 10609113979 + ... + 10609113984.

It is an arithmetic number, because the mean of its divisors is an integer number (21218227964).

Almost surely, 2^63654683889 is an apocalyptic number.

It is an amenable number.

63654683889 is a deficient number, since it is larger than the sum of its proper divisors (21218227967).

63654683889 is a wasteful number, since it uses less digits than its factorization.

63654683889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21218227966.

The product of its digits is 179159040, while the sum is 66.

The spelling of 63654683889 in words is "sixty-three billion, six hundred fifty-four million, six hundred eighty-three thousand, eight hundred eighty-nine".