12161335545 has 80 divisors (see below), whose sum is σ = 22149876672. Its totient is φ = 6382696320.

The previous prime is 12161335531. The next prime is 12161335553. The reversal of 12161335545 is 54553316121.

12161335545 is a `hidden beast` number, since 1 + 2 + 1 + 613 + 35 + 5 + 4 + 5 = 666.

It is not a de Polignac number, because 12161335545 - 2¹² = 12161331449 is a prime.

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 11126019 + ... + 11127111.

Almost surely, 2^12161335545 is an apocalyptic number.

12161335545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12161335545 is a deficient number, since it is larger than the sum of its proper divisors (9988541127).

12161335545 is a wasteful number, since it uses less digits than its factorization.

12161335545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524 (or 1515 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The spelling of 12161335545 in words is "twelve billion, one hundred sixty-one million, three hundred thirty-five thousand, five hundred forty-five".