66285752660 has 12 divisors (see below), whose sum is σ = 139200080628. Its totient is φ = 26514301056.

The previous prime is 66285752651. The next prime is 66285752671. The reversal of 66285752660 is 6625758266.

It can be written as a sum of positive squares in 2 ways, for example, as 11134048324 + 55151704336 = 105518^2 + 234844^2 .

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 3 ways as a sum of consecutive naturals, for example, 1657143797 + ... + 1657143836.

It is an arithmetic number, because the mean of its divisors is an integer number (11600006719).

Almost surely, 2^66285752660 is an apocalyptic number.

It is an amenable number.

66285752660 is an abundant number, since it is smaller than the sum of its proper divisors (72914327968).

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

66285752660 is a wasteful number, since it uses less digits than its factorization.

66285752660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3314287642 (or 3314287640 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 53.

It can be divided in two parts, 662857 and 52660, that added together give a palindrome (715517).

The spelling of 66285752660 in words is "sixty-six billion, two hundred eighty-five million, seven hundred fifty-two thousand, six hundred sixty".