1423220642449 has 2 divisors, whose sum is σ = 1423220642450. Its totient is φ = 1423220642448.

The previous prime is 1423220642443. The next prime is 1423220642461. The reversal of 1423220642449 is 9442460223241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 785362846849 + 637857795600 = 886207^2 + 798660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1423220642449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1423220642443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 711610321224 + 711610321225.

It is an arithmetic number, because the mean of its divisors is an integer number (711610321225).

Almost surely, 2^{1423220642449} is an apocalyptic number.

It is an amenable number.

1423220642449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1423220642449 is an equidigital number, since it uses as much as digits as its factorization.

1423220642449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 663552, while the sum is 43.

The spelling of 1423220642449 in words is "one trillion, four hundred twenty-three billion, two hundred twenty million, six hundred forty-two thousand, four hundred forty-nine".