12561636002 has 4 divisors (see below), whose sum is σ = 18842454006. Its totient is φ = 6280818000.

The previous prime is 12561635929. The next prime is 12561636007. The reversal of 12561636002 is 20063616521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11073142441 + 1488493561 = 105229^2 + 38581^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12561636002.

It is not an unprimeable number, because it can be changed into a prime (12561636007) 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 as a sum of consecutive naturals, namely, 3140408999 + ... + 3140409002.

Almost surely, 2^12561636002 is an apocalyptic number.

12561636002 is a deficient number, since it is larger than the sum of its proper divisors (6280818004).

12561636002 is an equidigital number, since it uses as much as digits as its factorization.

12561636002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6280818003.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 12561636002 in words is "twelve billion, five hundred sixty-one million, six hundred thirty-six thousand, two".