18213630585940 has 72 divisors (see below), whose sum is σ = 40032908013672. Its totient is φ = 6956528686080.

The previous prime is 18213630585937. The next prime is 18213630585949. The reversal of 18213630585940 is 4958503631281.

It can be written as a sum of positive squares in 4 ways, for example, as 358087347216 + 17855543238724 = 598404^2 + 4225582^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213630585949) 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 23 ways as a sum of consecutive naturals, for example, 3216177 + ... + 6838936.

It is an arithmetic number, because the mean of its divisors is an integer number (556012611301).

Almost surely, 2^{18213630585940} is an apocalyptic number.

18213630585940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18213630585940 is an abundant number, since it is smaller than the sum of its proper divisors (21819277427732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18213630585940 is a wasteful number, since it uses less digits than its factorization.

18213630585940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10055257 (or 10055208 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 18213630585940 in words is "eighteen trillion, two hundred thirteen billion, six hundred thirty million, five hundred eighty-five thousand, nine hundred forty".