38665785857 has 4 divisors (see below), whose sum is σ = 38921850816. Its totient is φ = 38409720900.

The previous prime is 38665785839. The next prime is 38665785871. The reversal of 38665785857 is 75858756683.

It is a happy number.

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: 75858756683 = 67 ⋅1132220249.

It is a cyclic number.

It is not a de Polignac number, because 38665785857 - 2¹⁴ = 38665769473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38665715857) 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, 128032253 + ... + 128032554.

It is an arithmetic number, because the mean of its divisors is an integer number (9730462704).

Almost surely, 2^38665785857 is an apocalyptic number.

It is an amenable number.

38665785857 is a deficient number, since it is larger than the sum of its proper divisors (256064959).

38665785857 is a wasteful number, since it uses less digits than its factorization.

38665785857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256064958.

The product of its digits is 338688000, while the sum is 68.

The spelling of 38665785857 in words is "thirty-eight billion, six hundred sixty-five million, seven hundred eighty-five thousand, eight hundred fifty-seven".