3615818881 has 4 divisors (see below), whose sum is σ = 3627371332. Its totient is φ = 3604266432.

The previous prime is 3615818867. The next prime is 3615818911. The reversal of 3615818881 is 1888185163.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1888185163 = 2437 ⋅774799.

It can be written as a sum of positive squares in 2 ways, for example, as 1804550400 + 1811268481 = 42480^2 + 42559^2 .

It is a cyclic number.

It is not a de Polignac number, because 3615818881 - 2⁵ = 3615818849 is a prime.

It is a super-2 number, since 2×3615818881² = 26148292360392184322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3615918881) 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, 5775756 + ... + 5776381.

It is an arithmetic number, because the mean of its divisors is an integer number (906842833).

Almost surely, 2^3615818881 is an apocalyptic number.

It is an amenable number.

3615818881 is a deficient number, since it is larger than the sum of its proper divisors (11552451).

3615818881 is a wasteful number, since it uses less digits than its factorization.

3615818881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11552450.

The product of its digits is 368640, while the sum is 49.

The square root of 3615818881 is about 60131.6795125498. The cubic root of 3615818881 is about 1534.8604287645.

The spelling of 3615818881 in words is "three billion, six hundred fifteen million, eight hundred eighteen thousand, eight hundred eighty-one".