66788770560 has 144 divisors (see below), whose sum is σ = 213515209824. Its totient is φ = 17792925696.

The previous prime is 66788770541. The next prime is 66788770591. The reversal of 66788770560 is 6507788766.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 66788770494 and 66788770503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4189164 + ... + 4205076.

Almost surely, 2^66788770560 is an apocalyptic number.

66788770560 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 66788770560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106757604912).

66788770560 is an abundant number, since it is smaller than the sum of its proper divisors (146726439264).

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

66788770560 is a wasteful number, since it uses less digits than its factorization.

66788770560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17030 (or 17016 counting only the distinct ones).

The product of its (nonzero) digits is 23708160, while the sum is 60.

The spelling of 66788770560 in words is "sixty-six billion, seven hundred eighty-eight million, seven hundred seventy thousand, five hundred sixty".