38915581512 has 64 divisors (see below), whose sum is σ = 99421562880. Its totient is φ = 12687861312.

The previous prime is 38915581499. The next prime is 38915581517. The reversal of 38915581512 is 21518551983.

It is a super-2 number, since 2×38915581512² (a number of 22 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 1933533 + ... + 1953555.

It is an arithmetic number, because the mean of its divisors is an integer number (1553461920).

Almost surely, 2^38915581512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38915581512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49710781440).

38915581512 is an abundant number, since it is smaller than the sum of its proper divisors (60505981368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38915581512 is a wasteful number, since it uses less digits than its factorization.

38915581512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21802 (or 21798 counting only the distinct ones).

The product of its digits is 432000, while the sum is 48.

The spelling of 38915581512 in words is "thirty-eight billion, nine hundred fifteen million, five hundred eighty-one thousand, five hundred twelve".