12155566560 has 48 divisors (see below), whose sum is σ = 38290036176. Its totient is φ = 3241484288.

The previous prime is 12155566537. The next prime is 12155566637. The reversal of 12155566560 is 6566555121.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 12661569 + ... + 12662528.

It is an arithmetic number, because the mean of its divisors is an integer number (797709087).

Almost surely, 2^12155566560 is an apocalyptic number.

12155566560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12155566560 is an abundant number, since it is smaller than the sum of its proper divisors (26134469616).

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

12155566560 is a wasteful number, since it uses less digits than its factorization.

12155566560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25324115 (or 25324107 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 42.

The spelling of 12155566560 in words is "twelve billion, one hundred fifty-five million, five hundred sixty-six thousand, five hundred sixty".