12012548985 has 24 divisors (see below), whose sum is σ = 20824304904. Its totient is φ = 6405907200.

The previous prime is 12012548981. The next prime is 12012549049. The reversal of 12012548985 is 58984521021.

12012548985 is a `hidden beast` number, since 1 + 2 + 0 + 12 + 548 + 98 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1774347129 + 10238201856 = 42123^2 + 101184^2 .

It is not a de Polignac number, because 12012548985 - 2² = 12012548981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 12012548985.

It is not an unprimeable number, because it can be changed into a prime (12012548981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 684379 + ... + 701711.

It is an arithmetic number, because the mean of its divisors is an integer number (867679371).

Almost surely, 2^12012548985 is an apocalyptic number.

12012548985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12012548985 is a deficient number, since it is larger than the sum of its proper divisors (8811755919).

12012548985 is a wasteful number, since it uses less digits than its factorization.

12012548985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32745 (or 32742 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 12012548985 in words is "twelve billion, twelve million, five hundred forty-eight thousand, nine hundred eighty-five".