663246121 has 2 divisors, whose sum is σ = 663246122. Its totient is φ = 663246120.

The previous prime is 663246113. The next prime is 663246139. The reversal of 663246121 is 121642366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 491242896 + 172003225 = 22164^2 + 13115^2 .

It is a cyclic number.

It is not a de Polignac number, because 663246121 - 2³ = 663246113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (663246151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331623060 + 331623061.

It is an arithmetic number, because the mean of its divisors is an integer number (331623061).

Almost surely, 2^663246121 is an apocalyptic number.

It is an amenable number.

663246121 is a deficient number, since it is larger than the sum of its proper divisors (1).

663246121 is an equidigital number, since it uses as much as digits as its factorization.

663246121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 663246121 is about 25753.5652095006. The cubic root of 663246121 is about 872.0838412393.

Adding to 663246121 its reverse (121642366), we get a palindrome (784888487).

The spelling of 663246121 in words is "six hundred sixty-three million, two hundred forty-six thousand, one hundred twenty-one".