64511975368 has 16 divisors (see below), whose sum is σ = 122765327280. Its totient is φ = 31774554768.

The previous prime is 64511975351. The next prime is 64511975369. The reversal of 64511975368 is 86357911546.

It is not an unprimeable number, because it can be changed into a prime (64511975369) 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, 60178546 + ... + 60179617.

It is an arithmetic number, because the mean of its divisors is an integer number (7672832955).

Almost surely, 2^64511975368 is an apocalyptic number.

It is an amenable number.

64511975368 is a deficient number, since it is larger than the sum of its proper divisors (58253351912).

64511975368 is a wasteful number, since it uses less digits than its factorization.

64511975368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120358236 (or 120358232 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 55.

The spelling of 64511975368 in words is "sixty-four billion, five hundred eleven million, nine hundred seventy-five thousand, three hundred sixty-eight".