66784504711608 has 160 divisors (see below), whose sum is σ = 195262758012960. Its totient is φ = 21285828622080.

The previous prime is 66784504711583. The next prime is 66784504711681. The reversal of 66784504711608 is 80611740548766.

66784504711608 is a `hidden beast` number, since 6 + 6 + 7 + 8 + 4 + 5 + 0 + 4 + 7 + 11 + 608 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 40034466 + ... + 41669262.

It is an arithmetic number, because the mean of its divisors is an integer number (1220392237581).

Almost surely, 2^{66784504711608} 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 66784504711608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97631379006480).

66784504711608 is an abundant number, since it is smaller than the sum of its proper divisors (128478253301352).

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

66784504711608 is a wasteful number, since it uses less digits than its factorization.

66784504711608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637579 (or 1637566 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 63.

The spelling of 66784504711608 in words is "sixty-six trillion, seven hundred eighty-four billion, five hundred four million, seven hundred eleven thousand, six hundred eight".