12561636035 has 24 divisors (see below), whose sum is σ = 16479788976. Its totient is φ = 9137620800.

The previous prime is 12561636023. The next prime is 12561636037. The reversal of 12561636035 is 53063616521.

It is not a de Polignac number, because 12561636035 - 2⁴ = 12561636019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12561636035.

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

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 270260 + ... + 313310.

It is an arithmetic number, because the mean of its divisors is an integer number (686657874).

Almost surely, 2^12561636035 is an apocalyptic number.

12561636035 is a deficient number, since it is larger than the sum of its proper divisors (3918152941).

12561636035 is an equidigital number, since it uses as much as digits as its factorization.

12561636035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43203 (or 43136 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 38.

The spelling of 12561636035 in words is "twelve billion, five hundred sixty-one million, six hundred thirty-six thousand, thirty-five".