815013404140 has 96 divisors (see below), whose sum is σ = 1869267165696. Its totient is φ = 296673269760.

The previous prime is 815013404129. The next prime is 815013404141. The reversal of 815013404140 is 41404310518.

It is not an unprimeable number, because it can be changed into a prime (815013404141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49168894 + ... + 49185466.

It is an arithmetic number, because the mean of its divisors is an integer number (19471532976).

Almost surely, 2^815013404140 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 815013404140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (934633582848).

815013404140 is an abundant number, since it is smaller than the sum of its proper divisors (1054253761556).

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

815013404140 is a wasteful number, since it uses less digits than its factorization.

815013404140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19259 (or 19257 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 815013404140 its reverse (41404310518), we get a palindrome (856417714658).

The spelling of 815013404140 in words is "eight hundred fifteen billion, thirteen million, four hundred four thousand, one hundred forty".