18255340413 has 20 divisors (see below), whose sum is σ = 28210682940. Its totient is φ = 11750562432.

The previous prime is 18255340409. The next prime is 18255340417. The reversal of 18255340413 is 31404355281.

18255340413 is a `hidden beast` number, since 1 + 82 + 5 + 534 + 0 + 41 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (18255340409) and next prime (18255340417).

It can be written as a sum of positive squares in 2 ways, for example, as 7807843044 + 10447497369 = 88362^2 + 102213^2 .

It is not a de Polignac number, because 18255340413 - 2² = 18255340409 is a prime.

It is a super-2 number, since 2×18255340413² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18255340417) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3883420 + ... + 3888117.

It is an arithmetic number, because the mean of its divisors is an integer number (1410534147).

Almost surely, 2^18255340413 is an apocalyptic number.

It is an amenable number.

18255340413 is a deficient number, since it is larger than the sum of its proper divisors (9955342527).

18255340413 is an equidigital number, since it uses as much as digits as its factorization.

18255340413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7771578 (or 7771569 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 18255340413 its reverse (31404355281), we get a palindrome (49659695694).

The spelling of 18255340413 in words is "eighteen billion, two hundred fifty-five million, three hundred forty thousand, four hundred thirteen".