12181704520 has 32 divisors (see below), whose sum is σ = 27550867320. Its totient is φ = 4847431680.

The previous prime is 12181704481. The next prime is 12181704539. The reversal of 12181704520 is 2540718121.

It can be written as a sum of positive squares in 4 ways, for example, as 11440013764 + 741690756 = 106958^2 + 27234^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 781251 + ... + 796690.

Almost surely, 2^12181704520 is an apocalyptic number.

12181704520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12181704520 is an abundant number, since it is smaller than the sum of its proper divisors (15369162800).

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

12181704520 is a wasteful number, since it uses less digits than its factorization.

12181704520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578145 (or 1578141 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The spelling of 12181704520 in words is "twelve billion, one hundred eighty-one million, seven hundred four thousand, five hundred twenty".