6489778159944 has 96 divisors (see below), whose sum is σ = 19186803636000. Its totient is φ = 2049403617792.

The previous prime is 6489778159903. The next prime is 6489778159957. The reversal of 6489778159944 is 4499518779846.

6489778159944 is a `hidden beast` number, since 6 + 489 + 7 + 7 + 8 + 1 + 5 + 99 + 44 = 666.

It is a super-2 number, since 2×6489778159944² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

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 23 ways as a sum of consecutive naturals, for example, 87814729 + ... + 87888600.

It is an arithmetic number, because the mean of its divisors is an integer number (199862537875).

Almost surely, 2^{6489778159944} is an apocalyptic number.

It is an amenable number.

6489778159944 is an abundant number, since it is smaller than the sum of its proper divisors (12697025476056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6489778159944 is a wasteful number, since it uses less digits than its factorization.

6489778159944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175703369 (or 175703353 counting only the distinct ones).

The product of its digits is 4389396480, while the sum is 81.

The spelling of 6489778159944 in words is "six trillion, four hundred eighty-nine billion, seven hundred seventy-eight million, one hundred fifty-nine thousand, nine hundred forty-four".