18240540253 has 8 divisors (see below), whose sum is σ = 19645227000. Its totient is φ = 16836077568.

The previous prime is 18240540239. The next prime is 18240540259. The reversal of 18240540253 is 35204504281.

It can be written as a sum of positive squares in 4 ways, for example, as 3076588089 + 15163952164 = 55467^2 + 123142^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18240540253 - 2¹⁷ = 18240409181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18240540259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137973 + ... + 235621.

It is an arithmetic number, because the mean of its divisors is an integer number (2455653375).

Almost surely, 2^18240540253 is an apocalyptic number.

18240540253 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18240540253 is a deficient number, since it is larger than the sum of its proper divisors (1404686747).

18240540253 is a wasteful number, since it uses less digits than its factorization.

18240540253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112031.

The product of its (nonzero) digits is 38400, while the sum is 34.

The spelling of 18240540253 in words is "eighteen billion, two hundred forty million, five hundred forty thousand, two hundred fifty-three".