64678553065 has 16 divisors (see below), whose sum is σ = 88707796992. Its totient is φ = 44348117184.

The previous prime is 64678553063. The next prime is 64678553077. The reversal of 64678553065 is 56035587646.

It is not a de Polignac number, because 64678553065 - 2¹ = 64678553063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64678552997 and 64678553015.

It is not an unprimeable number, because it can be changed into a prime (64678553063) 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 15 ways as a sum of consecutive naturals, for example, 580447 + ... + 682843.

It is an arithmetic number, because the mean of its divisors is an integer number (5544237312).

Almost surely, 2^64678553065 is an apocalyptic number.

It is an amenable number.

64678553065 is a deficient number, since it is larger than the sum of its proper divisors (24029243927).

64678553065 is a wasteful number, since it uses less digits than its factorization.

64678553065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120456.

The product of its (nonzero) digits is 18144000, while the sum is 55.

The spelling of 64678553065 in words is "sixty-four billion, six hundred seventy-eight million, five hundred fifty-three thousand, sixty-five".