3866638613 has 4 divisors (see below), whose sum is σ = 3866783520. Its totient is φ = 3866493708.

The previous prime is 3866638597. The next prime is 3866638637. The reversal of 3866638613 is 3168366683.

3866638613 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3168366683 = 569 ⋅5568307.

It is a cyclic number.

It is not a de Polignac number, because 3866638613 - 2⁴ = 3866638597 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 (3866638673) 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, 19553 + ... + 90086.

It is an arithmetic number, because the mean of its divisors is an integer number (966695880).

Almost surely, 2^3866638613 is an apocalyptic number.

It is an amenable number.

3866638613 is a deficient number, since it is larger than the sum of its proper divisors (144907).

3866638613 is a wasteful number, since it uses less digits than its factorization.

3866638613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144906.

The product of its digits is 2239488, while the sum is 50.

The square root of 3866638613 is about 62182.3014450253. The cubic root of 3866638613 is about 1569.5597793439.

The spelling of 3866638613 in words is "three billion, eight hundred sixty-six million, six hundred thirty-eight thousand, six hundred thirteen".