12016636506621 has 12 divisors (see below), whose sum is σ = 17383944806748. Its totient is φ = 7998822867264.

The previous prime is 12016636506619. The next prime is 12016636506629. The reversal of 12016636506621 is 12660563661021.

12016636506621 is a `hidden beast` number, since 1 + 2 + 0 + 1 + 6 + 636 + 5 + 0 + 6 + 6 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4334099422500 + 7682537084121 = 2081850^2 + 2771739^2 .

It is not a de Polignac number, because 12016636506621 - 2¹ = 12016636506619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12016636506629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1022338560 + ... + 1022350313.

It is an arithmetic number, because the mean of its divisors is an integer number (1448662067229).

Almost surely, 2^{12016636506621} is an apocalyptic number.

It is an amenable number.

12016636506621 is a deficient number, since it is larger than the sum of its proper divisors (5367308300127).

12016636506621 is a wasteful number, since it uses less digits than its factorization.

12016636506621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2044689532 (or 2044689529 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 12016636506621 in words is "twelve trillion, sixteen billion, six hundred thirty-six million, five hundred six thousand, six hundred twenty-one".