17786668772 has 12 divisors (see below), whose sum is σ = 31713966396. Its totient is φ = 8725535520.

The previous prime is 17786668769. The next prime is 17786668777. The reversal of 17786668772 is 27786668771.

It can be written as a sum of positive squares in 2 ways, for example, as 16329261796 + 1457406976 = 127786^2 + 38176^2 .

It is a junction number, because it is equal to n+sod(n) for n = 17786668699 and 17786668708.

It is not an unprimeable number, because it can be changed into a prime (17786668777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41949479 + ... + 41949902.

It is an arithmetic number, because the mean of its divisors is an integer number (2642830533).

Almost surely, 2^17786668772 is an apocalyptic number.

It is an amenable number.

17786668772 is a deficient number, since it is larger than the sum of its proper divisors (13927297624).

17786668772 is a wasteful number, since it uses less digits than its factorization.

17786668772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83899438 (or 83899436 counting only the distinct ones).

The product of its digits is 66382848, while the sum is 65.

Subtracting 17786668772 from its reverse (27786668771), we obtain a palindrome (9999999999).

The spelling of 17786668772 in words is "seventeen billion, seven hundred eighty-six million, six hundred sixty-eight thousand, seven hundred seventy-two".