38039863681 has 4 divisors (see below), whose sum is σ = 38757597012. Its totient is φ = 37322130352.

The previous prime is 38039863583. The next prime is 38039863753. The reversal of 38039863681 is 18636893083.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18636893083 = 151 ⋅123423133.

It can be written as a sum of positive squares in 2 ways, for example, as 22728276081 + 15311587600 = 150759^2 + 123740^2 .

It is a cyclic number.

It is not a de Polignac number, because 38039863681 - 2¹³ = 38039855489 is a prime.

It is a super-2 number, since 2×38039863681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38039860681) 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, 358866586 + ... + 358866691.

It is an arithmetic number, because the mean of its divisors is an integer number (9689399253).

Almost surely, 2^38039863681 is an apocalyptic number.

It is an amenable number.

38039863681 is a deficient number, since it is larger than the sum of its proper divisors (717733331).

38039863681 is an equidigital number, since it uses as much as digits as its factorization.

38039863681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717733330.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 38039863681 in words is "thirty-eight billion, thirty-nine million, eight hundred sixty-three thousand, six hundred eighty-one".