8815815381 has 8 divisors (see below), whose sum is σ = 11755814464. Its totient is φ = 5876513280.

The previous prime is 8815815373. The next prime is 8815815419. The reversal of 8815815381 is 1835185188.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8815815381 - 2³ = 8815815373 is a prime.

It is a super-2 number, since 2×8815815381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8815815381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8815815361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143980 + ... + 195861.

It is an arithmetic number, because the mean of its divisors is an integer number (1469476808).

Almost surely, 2^8815815381 is an apocalyptic number.

It is an amenable number.

8815815381 is a deficient number, since it is larger than the sum of its proper divisors (2939999083).

8815815381 is a wasteful number, since it uses less digits than its factorization.

8815815381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348491.

The product of its digits is 307200, while the sum is 48.

The square root of 8815815381 is about 93892.5736200686. The cubic root of 8815815381 is about 2065.7963015764.

The spelling of 8815815381 in words is "eight billion, eight hundred fifteen million, eight hundred fifteen thousand, three hundred eighty-one".