12420013649 has 2 divisors, whose sum is σ = 12420013650. Its totient is φ = 12420013648.

The previous prime is 12420013643. The next prime is 12420013673. The reversal of 12420013649 is 94631002421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10698178624 + 1721835025 = 103432^2 + 41495^2 .

It is a cyclic number.

It is not a de Polignac number, because 12420013649 - 2²⁰ = 12418965073 is a prime.

It is not a weakly prime, because it can be changed into another prime (12420013643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210006824 + 6210006825.

It is an arithmetic number, because the mean of its divisors is an integer number (6210006825).

Almost surely, 2^12420013649 is an apocalyptic number.

It is an amenable number.

12420013649 is a deficient number, since it is larger than the sum of its proper divisors (1).

12420013649 is an equidigital number, since it uses as much as digits as its factorization.

12420013649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 12420013649 in words is "twelve billion, four hundred twenty million, thirteen thousand, six hundred forty-nine".