13666047669 has 12 divisors (see below), whose sum is σ = 20901014316. Its totient is φ = 8574774912.

The previous prime is 13666047617. The next prime is 13666047671. The reversal of 13666047669 is 96674066631.

It can be written as a sum of positive squares in 2 ways, for example, as 7333867044 + 6332180625 = 85638^2 + 79575^2 .

It is not a de Polignac number, because 13666047669 - 2⁷ = 13666047541 is a prime.

It is a super-2 number, since 2×13666047669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13666042669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44660134 + ... + 44660439.

It is an arithmetic number, because the mean of its divisors is an integer number (1741751193).

Almost surely, 2^13666047669 is an apocalyptic number.

It is an amenable number.

13666047669 is a deficient number, since it is larger than the sum of its proper divisors (7234966647).

13666047669 is a wasteful number, since it uses less digits than its factorization.

13666047669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89320596 (or 89320593 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 54.

The spelling of 13666047669 in words is "thirteen billion, six hundred sixty-six million, forty-seven thousand, six hundred sixty-nine".