38665802129 has 4 divisors (see below), whose sum is σ = 38701050084. Its totient is φ = 38630554176.

The previous prime is 38665802089. The next prime is 38665802183. The reversal of 38665802129 is 92120856683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92120856683 = 41 ⋅2246850163.

It can be written as a sum of positive squares in 2 ways, for example, as 3313153600 + 35352648529 = 57560^2 + 188023^2 .

It is a cyclic number.

It is not a de Polignac number, because 38665802129 - 2²⁰ = 38664753553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38625802129) 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, 17622332 + ... + 17624525.

It is an arithmetic number, because the mean of its divisors is an integer number (9675262521).

Almost surely, 2^38665802129 is an apocalyptic number.

It is an amenable number.

38665802129 is a deficient number, since it is larger than the sum of its proper divisors (35247955).

38665802129 is a wasteful number, since it uses less digits than its factorization.

38665802129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35247954.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 38665802129 in words is "thirty-eight billion, six hundred sixty-five million, eight hundred two thousand, one hundred twenty-nine".