18210561336 has 48 divisors (see below), whose sum is σ = 53803933560. Its totient is φ = 5518351680.

The previous prime is 18210561329. The next prime is 18210561337. The reversal of 18210561336 is 63316501281.

18210561336 is a `hidden beast` number, since 1 + 8 + 2 + 1 + 0 + 5 + 613 + 36 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18210561336.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18210561337) 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, 11495775 + ... + 11497358.

Almost surely, 2^18210561336 is an apocalyptic number.

It is an amenable number.

18210561336 is an abundant number, since it is smaller than the sum of its proper divisors (35593372224).

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

18210561336 is a wasteful number, since it uses less digits than its factorization.

18210561336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22993156 (or 22993149 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 18210561336 in words is "eighteen billion, two hundred ten million, five hundred sixty-one thousand, three hundred thirty-six".