18415415441 has 4 divisors (see below), whose sum is σ = 18487071012. Its totient is φ = 18343759872.

The previous prime is 18415415437. The next prime is 18415415453. The reversal of 18415415441 is 14451451481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14451451481 = 43 ⋅336080267.

It can be written as a sum of positive squares in 2 ways, for example, as 16837657600 + 1577757841 = 129760^2 + 39721^2 .

It is a cyclic number.

It is not a de Polignac number, because 18415415441 - 2² = 18415415437 is a prime.

It is a super-3 number, since 3×18415415441³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18415415395 and 18415415404.

It is not an unprimeable number, because it can be changed into a prime (18415415471) 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, 35827400 + ... + 35827913.

It is an arithmetic number, because the mean of its divisors is an integer number (4621767753).

Almost surely, 2^18415415441 is an apocalyptic number.

It is an amenable number.

18415415441 is a deficient number, since it is larger than the sum of its proper divisors (71655571).

18415415441 is an equidigital number, since it uses as much as digits as its factorization.

18415415441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71655570.

The product of its digits is 51200, while the sum is 38.

The spelling of 18415415441 in words is "eighteen billion, four hundred fifteen million, four hundred fifteen thousand, four hundred forty-one".