3666686835349 has 4 divisors (see below), whose sum is σ = 3793124312460. Its totient is φ = 3540249358240.

The previous prime is 3666686835337. The next prime is 3666686835379. The reversal of 3666686835349 is 9435386866663.

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

It can be written as a sum of positive squares in 2 ways, for example, as 652956115249 + 3013730720100 = 808057^2 + 1736010^2 .

It is a cyclic number.

It is not a de Polignac number, because 3666686835349 - 2⁴¹ = 1467663579797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666686835379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63218738512 + ... + 63218738569.

It is an arithmetic number, because the mean of its divisors is an integer number (948281078115).

Almost surely, 2^{3666686835349} is an apocalyptic number.

It is an amenable number.

3666686835349 is a deficient number, since it is larger than the sum of its proper divisors (126437477111).

3666686835349 is a wasteful number, since it uses less digits than its factorization.

3666686835349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126437477110.

The product of its digits is 2418647040, while the sum is 73.

The spelling of 3666686835349 in words is "three trillion, six hundred sixty-six billion, six hundred eighty-six million, eight hundred thirty-five thousand, three hundred forty-nine".