64645979712 has 56 divisors (see below), whose sum is σ = 171071450592. Its totient is φ = 21545011200.

The previous prime is 64645979707. The next prime is 64645979731. The reversal of 64645979712 is 21797954646.

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 7 ways as a sum of consecutive naturals, for example, 1259512 + ... + 1309832.

It is an arithmetic number, because the mean of its divisors is an integer number (3054847332).

Almost surely, 2^64645979712 is an apocalyptic number.

It is an amenable number.

64645979712 is an abundant number, since it is smaller than the sum of its proper divisors (106425470880).

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

64645979712 is a wasteful number, since it uses less digits than its factorization.

64645979712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57027 (or 57017 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 60.

The spelling of 64645979712 in words is "sixty-four billion, six hundred forty-five million, nine hundred seventy-nine thousand, seven hundred twelve".