13470809666 has 4 divisors (see below), whose sum is σ = 20206214502. Its totient is φ = 6735404832.

The previous prime is 13470809663. The next prime is 13470809711. The reversal of 13470809666 is 66690807431.

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., 13065633025 + 405176641 = 114305^2 + 20129^2 .

It is a super-3 number, since 3×13470809666³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (13470809663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3367702415 + ... + 3367702418.

Almost surely, 2^13470809666 is an apocalyptic number.

13470809666 is a deficient number, since it is larger than the sum of its proper divisors (6735404836).

13470809666 is an equidigital number, since it uses as much as digits as its factorization.

13470809666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6735404835.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 13470809666 in words is "thirteen billion, four hundred seventy million, eight hundred nine thousand, six hundred sixty-six".