38915581513 has 4 divisors (see below), whose sum is σ = 38919137040. Its totient is φ = 38912025988.

The previous prime is 38915581499. The next prime is 38915581517. The reversal of 38915581513 is 31518551983.

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.

It is a cyclic number.

It is not a de Polignac number, because 38915581513 - 2²⁵ = 38882027081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38915581517) 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, 1761295 + ... + 1783252.

It is an arithmetic number, because the mean of its divisors is an integer number (9729784260).

Almost surely, 2^38915581513 is an apocalyptic number.

It is an amenable number.

38915581513 is a deficient number, since it is larger than the sum of its proper divisors (3555527).

38915581513 is a wasteful number, since it uses less digits than its factorization.

38915581513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3555526.

The product of its digits is 648000, while the sum is 49.

The spelling of 38915581513 in words is "thirty-eight billion, nine hundred fifteen million, five hundred eighty-one thousand, five hundred thirteen".