38515018381 has 4 divisors (see below), whose sum is σ = 44017163872. Its totient is φ = 33012872892.

The previous prime is 38515018319. The next prime is 38515018411. The reversal of 38515018381 is 18381051583.

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: 18381051583 = 3643 ⋅5045581.

It is a cyclic number.

It is not a de Polignac number, because 38515018381 - 2⁹ = 38515017869 is a prime.

It is a super-2 number, since 2×38515018381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38515018301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2751072735 + ... + 2751072748.

It is an arithmetic number, because the mean of its divisors is an integer number (11004290968).

Almost surely, 2^38515018381 is an apocalyptic number.

It is an amenable number.

38515018381 is a deficient number, since it is larger than the sum of its proper divisors (5502145491).

38515018381 is an equidigital number, since it uses as much as digits as its factorization.

38515018381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5502145490.

The product of its (nonzero) digits is 115200, while the sum is 43.

The spelling of 38515018381 in words is "thirty-eight billion, five hundred fifteen million, eighteen thousand, three hundred eighty-one".