18354547204520 has 16 divisors (see below), whose sum is σ = 41297731210260. Its totient is φ = 7341818881792.

The previous prime is 18354547204463. The next prime is 18354547204577. The reversal of 18354547204520 is 2540274545381.

It is an interprime number because it is at equal distance from previous prime (18354547204463) and next prime (18354547204577).

It can be written as a sum of positive squares in 2 ways, for example, as 16843029408676 + 1511517795844 = 4104026^2 + 1229438^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229431840017 + ... + 229431840096.

Almost surely, 2^{18354547204520} is an apocalyptic number.

18354547204520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18354547204520 is an abundant number, since it is smaller than the sum of its proper divisors (22943184005740).

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

18354547204520 is a wasteful number, since it uses less digits than its factorization.

18354547204520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458863680124 (or 458863680120 counting only the distinct ones).

The product of its (nonzero) digits is 5376000, while the sum is 50.

The spelling of 18354547204520 in words is "eighteen trillion, three hundred fifty-four billion, five hundred forty-seven million, two hundred four thousand, five hundred twenty".