64784281689 has 6 divisors (see below), whose sum is σ = 93577295786. Its totient is φ = 43189521120.

The previous prime is 64784281613. The next prime is 64784281699. The reversal of 64784281689 is 98618248746.

64784281689 is a `hidden beast` number, since 6 + 47 + 8 + 428 + 168 + 9 = 666.

64784281689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 33751936089 + 31032345600 = 183717^2 + 176160^2 .

It is not a de Polignac number, because 64784281689 - 2⁸ = 64784281433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64784281699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3599126752 + ... + 3599126769.

Almost surely, 2^64784281689 is an apocalyptic number.

It is an amenable number.

64784281689 is a deficient number, since it is larger than the sum of its proper divisors (28793014097).

64784281689 is a wasteful number, since it uses less digits than its factorization.

64784281689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7198253527 (or 7198253524 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 63.

The spelling of 64784281689 in words is "sixty-four billion, seven hundred eighty-four million, two hundred eighty-one thousand, six hundred eighty-nine".