1243662663421 has 8 divisors (see below), whose sum is σ = 1250241144120. Its totient is φ = 1237085571072.

The previous prime is 1243662663391. The next prime is 1243662663431.

It is a happy number.

1243662663421 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 425743200100 + 817919463321 = 652490^2 + 904389^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1243662663421 - 2¹³ = 1243662655229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243662663431) 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 7 ways as a sum of consecutive naturals, for example, 1474425 + ... + 2158993.

It is an arithmetic number, because the mean of its divisors is an integer number (156280143015).

Almost surely, 2^{1243662663421} is an apocalyptic number.

It is an amenable number.

1243662663421 is a deficient number, since it is larger than the sum of its proper divisors (6578480699).

1243662663421 is an equidigital number, since it uses as much as digits as its factorization.

1243662663421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694175.

The product of its digits is 1492992, while the sum is 46.

The spelling of 1243662663421 in words is "one trillion, two hundred forty-three billion, six hundred sixty-two million, six hundred sixty-three thousand, four hundred twenty-one".