1660381784064 has 336 divisors, whose sum is σ = 5037999876000. Its totient is φ = 546751586304.

The previous prime is 1660381784057. The next prime is 1660381784071. The reversal of 1660381784064 is 4604871830661.

1660381784064 is a `hidden beast` number, since 1 + 6 + 60 + 3 + 8 + 178 + 406 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (1660381784057) and next prime (1660381784071).

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 1660381784064.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 123911637 + ... + 123925035.

It is an arithmetic number, because the mean of its divisors is an integer number (14994047250).

Almost surely, 2^{1660381784064} 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 1660381784064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2518999938000).

1660381784064 is an abundant number, since it is smaller than the sum of its proper divisors (3377618091936).

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

1660381784064 is an frugal number, since it uses more digits than its factorization.

1660381784064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13522 (or 13487 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 1660381784064 in words is "one trillion, six hundred sixty billion, three hundred eighty-one million, seven hundred eighty-four thousand, sixty-four".