12561636033 has 16 divisors (see below), whose sum is σ = 18689711040. Its totient is φ = 8338478112.

The previous prime is 12561636023. The next prime is 12561636037. The reversal of 12561636033 is 33063616521.

12561636033 is a `hidden beast` number, since 1 + 2 + 5 + 616 + 3 + 6 + 0 + 33 = 666.

It is not a de Polignac number, because 12561636033 - 2¹⁴ = 12561619649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12561636037) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 992091 + ... + 1004672.

It is an arithmetic number, because the mean of its divisors is an integer number (1168106940).

Almost surely, 2^12561636033 is an apocalyptic number.

It is an amenable number.

12561636033 is a deficient number, since it is larger than the sum of its proper divisors (6128075007).

12561636033 is a wasteful number, since it uses less digits than its factorization.

12561636033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997005 (or 1996999 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The spelling of 12561636033 in words is "twelve billion, five hundred sixty-one million, six hundred thirty-six thousand, thirty-three".