66704787860 has 24 divisors (see below), whose sum is σ = 141020195400. Its totient is φ = 26502840704.

The previous prime is 66704787847. The next prime is 66704787889. The reversal of 66704787860 is 6878740766.

It can be written as a sum of positive squares in 4 ways, for example, as 101566084 + 66603221776 = 10078^2 + 258076^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66704787860.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11189099 + ... + 11195058.

It is an arithmetic number, because the mean of its divisors is an integer number (5875841475).

Almost surely, 2^66704787860 is an apocalyptic number.

It is an amenable number.

66704787860 is an abundant number, since it is smaller than the sum of its proper divisors (74315407540).

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

66704787860 is a wasteful number, since it uses less digits than its factorization.

66704787860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22384315 (or 22384313 counting only the distinct ones).

The product of its (nonzero) digits is 18966528, while the sum is 59.

The spelling of 66704787860 in words is "sixty-six billion, seven hundred four million, seven hundred eighty-seven thousand, eight hundred sixty".