64689319872 has 56 divisors (see below), whose sum is σ = 190174626000. Its totient is φ = 21563106048.

The previous prime is 64689319861. The next prime is 64689319957. The reversal of 64689319872 is 27891398646.

64689319872 is a `hidden beast` number, since 6 + 468 + 93 + 1 + 9 + 87 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18716247 + ... + 18719702.

Almost surely, 2^64689319872 is an apocalyptic number.

It is an amenable number.

64689319872 is an abundant number, since it is smaller than the sum of its proper divisors (125485306128).

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

64689319872 is a wasteful number, since it uses less digits than its factorization.

64689319872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37435970 (or 37435954 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 63.

The spelling of 64689319872 in words is "sixty-four billion, six hundred eighty-nine million, three hundred nineteen thousand, eight hundred seventy-two".