64666784736 has 36 divisors (see below), whose sum is σ = 183896169912. Its totient is φ = 21555594816.

The previous prime is 64666784723. The next prime is 64666784737. The reversal of 64666784736 is 63748766646.

It is a happy number.

64666784736 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64666784737) 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, 112268436 + ... + 112269011.

It is an arithmetic number, because the mean of its divisors is an integer number (5108226942).

Almost surely, 2^64666784736 is an apocalyptic number.

It is an amenable number.

64666784736 is an abundant number, since it is smaller than the sum of its proper divisors (119229385176).

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

64666784736 is a wasteful number, since it uses less digits than its factorization.

64666784736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224537463 (or 224537452 counting only the distinct ones).

The product of its digits is 146313216, while the sum is 63.

The spelling of 64666784736 in words is "sixty-four billion, six hundred sixty-six million, seven hundred eighty-four thousand, seven hundred thirty-six".