12186661540 has 24 divisors (see below), whose sum is σ = 25633359360. Its totient is φ = 4866784608.

The previous prime is 12186661489. The next prime is 12186661607. The reversal of 12186661540 is 4516668121.

It is a junction number, because it is equal to n+sod(n) for n = 12186661493 and 12186661502.

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, 479812 + ... + 504571.

It is an arithmetic number, because the mean of its divisors is an integer number (1068056640).

Almost surely, 2^12186661540 is an apocalyptic number.

12186661540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12186661540 is an abundant number, since it is smaller than the sum of its proper divisors (13446697820).

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

12186661540 is a wasteful number, since it uses less digits than its factorization.

12186661540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985011 (or 985009 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 12186661540 in words is "twelve billion, one hundred eighty-six million, six hundred sixty-one thousand, five hundred forty".