64755774720 has 864 divisors, whose sum is σ = 277988186112. Its totient is φ = 13552386048.

The previous prime is 64755774647. The next prime is 64755774773. The reversal of 64755774720 is 2747755746.

64755774720 is a `hidden beast` number, since 6 + 4 + 7 + 5 + 577 + 47 + 20 = 666.

64755774720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 233775222 + ... + 233775498.

Almost surely, 2^64755774720 is an apocalyptic number.

64755774720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64755774720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138994093056).

64755774720 is an abundant number, since it is smaller than the sum of its proper divisors (213232411392).

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

64755774720 is a wasteful number, since it uses less digits than its factorization.

64755774720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547 (or 530 counting only the distinct ones).

The product of its (nonzero) digits is 11524800, while the sum is 54.

The spelling of 64755774720 in words is "sixty-four billion, seven hundred fifty-five million, seven hundred seventy-four thousand, seven hundred twenty".