13523378866 has 4 divisors (see below), whose sum is σ = 20285068302. Its totient is φ = 6761689432.

The previous prime is 13523378833. The next prime is 13523378867. The reversal of 13523378866 is 66887332531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7419238225 + 6104140641 = 86135^2 + 78129^2 .

It is not an unprimeable number, because it can be changed into a prime (13523378867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3380844715 + ... + 3380844718.

Almost surely, 2^13523378866 is an apocalyptic number.

13523378866 is a deficient number, since it is larger than the sum of its proper divisors (6761689436).

13523378866 is an equidigital number, since it uses as much as digits as its factorization.

13523378866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6761689435.

The product of its digits is 4354560, while the sum is 52.

The spelling of 13523378866 in words is "thirteen billion, five hundred twenty-three million, three hundred seventy-eight thousand, eight hundred sixty-six".