64878508739889 has 128 divisors (see below), whose sum is σ = 111070310400000. Its totient is φ = 37091280934656.

The previous prime is 64878508739839. The next prime is 64878508739959. The reversal of 64878508739889 is 98893780587846.

64878508739889 is a `hidden beast` number, since 6 + 4 + 8 + 7 + 8 + 508 + 7 + 3 + 98 + 8 + 9 = 666.

64878508739889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64878508739889 - 2¹² = 64878508735793 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64878508739799 and 64878508739808.

It is not an unprimeable number, because it can be changed into a prime (64878508739839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 706514632 + ... + 706606454.

It is an arithmetic number, because the mean of its divisors is an integer number (867736800000).

Almost surely, 2^{64878508739889} is an apocalyptic number.

It is an amenable number.

64878508739889 is a deficient number, since it is larger than the sum of its proper divisors (46191801660111).

64878508739889 is a wasteful number, since it uses less digits than its factorization.

64878508739889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93916 (or 93910 counting only the distinct ones).

The product of its (nonzero) digits is 46820229120, while the sum is 90.

The spelling of 64878508739889 in words is "sixty-four trillion, eight hundred seventy-eight billion, five hundred eight million, seven hundred thirty-nine thousand, eight hundred eighty-nine".