18285490938493 has 12 divisors (see below), whose sum is σ = 20005806777660. Its totient is φ = 16654716589440.

The previous prime is 18285490938479. The next prime is 18285490938557. The reversal of 18285490938493 is 39483909458281.

It can be written as a sum of positive squares in 2 ways, for example, as 11616897439449 + 6668593499044 = 3408357^2 + 2582362^2 .

It is not a de Polignac number, because 18285490938493 - 2²¹ = 18285488841341 is a prime.

It is a super-2 number, since 2×18285490938493² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18285490938413) 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 11 ways as a sum of consecutive naturals, for example, 559617958 + ... + 559650631.

It is an arithmetic number, because the mean of its divisors is an integer number (1667150564805).

Almost surely, 2^{18285490938493} is an apocalyptic number.

It is an amenable number.

18285490938493 is a deficient number, since it is larger than the sum of its proper divisors (1720315839167).

18285490938493 is a wasteful number, since it uses less digits than its factorization.

18285490938493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119268668 (or 1119268637 counting only the distinct ones).

The product of its (nonzero) digits is 537477120, while the sum is 73.

The spelling of 18285490938493 in words is "eighteen trillion, two hundred eighty-five billion, four hundred ninety million, nine hundred thirty-eight thousand, four hundred ninety-three".