64971400668 has 24 divisors (see below), whose sum is σ = 151829302800. Its totient is φ = 21624366720.

The previous prime is 64971400639. The next prime is 64971400673. The reversal of 64971400668 is 86600417946.

64971400668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 64971400668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4087593 + ... + 4103456.

It is an arithmetic number, because the mean of its divisors is an integer number (6326220950).

Almost surely, 2^64971400668 is an apocalyptic number.

It is an amenable number.

64971400668 is an abundant number, since it is smaller than the sum of its proper divisors (86857902132).

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

64971400668 is a wasteful number, since it uses less digits than its factorization.

64971400668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8191717 (or 8191715 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 64971400668 in words is "sixty-four billion, nine hundred seventy-one million, four hundred thousand, six hundred sixty-eight".