64740168864 has 864 divisors, whose sum is σ = 238073472000. Its totient is φ = 17283248640.

The previous prime is 64740168853. The next prime is 64740168877. The reversal of 64740168864 is 46886104746.

64740168864 is a `hidden beast` number, since 6 + 474 + 0 + 168 + 8 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 64740168864.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2088392529 + ... + 2088392559.

It is an arithmetic number, because the mean of its divisors is an integer number (275548000).

Almost surely, 2^64740168864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64740168864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119036736000).

64740168864 is an abundant number, since it is smaller than the sum of its proper divisors (173333303136).

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

64740168864 is an frugal number, since it uses more digits than its factorization.

64740168864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 54.

The spelling of 64740168864 in words is "sixty-four billion, seven hundred forty million, one hundred sixty-eight thousand, eight hundred sixty-four".