12420064649 has 4 divisors (see below), whose sum is σ = 12421730580. Its totient is φ = 12418398720.

The previous prime is 12420064603. The next prime is 12420064667. The reversal of 12420064649 is 94646002421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94646002421 = 137 ⋅690846733.

It can be written as a sum of positive squares in 2 ways, for example, as 1974202624 + 10445862025 = 44432^2 + 102205^2 .

It is a cyclic number.

It is not a de Polignac number, because 12420064649 - 2¹⁶ = 12419999113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12420064669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821732 + ... + 836709.

It is an arithmetic number, because the mean of its divisors is an integer number (3105432645).

Almost surely, 2^12420064649 is an apocalyptic number.

It is an amenable number.

12420064649 is a deficient number, since it is larger than the sum of its proper divisors (1665931).

12420064649 is an equidigital number, since it uses as much as digits as its factorization.

12420064649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665930.

The product of its (nonzero) digits is 82944, while the sum is 38.

The spelling of 12420064649 in words is "twelve billion, four hundred twenty million, sixty-four thousand, six hundred forty-nine".