646963453 has 2 divisors, whose sum is σ = 646963454. Its totient is φ = 646963452.

The previous prime is 646963439. The next prime is 646963487. The reversal of 646963453 is 354369646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 461949049 + 185014404 = 21493^2 + 13602^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646963453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646963253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323481726 + 323481727.

It is an arithmetic number, because the mean of its divisors is an integer number (323481727).

Almost surely, 2^646963453 is an apocalyptic number.

It is an amenable number.

646963453 is a deficient number, since it is larger than the sum of its proper divisors (1).

646963453 is an equidigital number, since it uses as much as digits as its factorization.

646963453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 46.

The square root of 646963453 is about 25435.4762683933. The cubic root of 646963453 is about 864.8880886994. Note that the first 3 decimals are identical.

The spelling of 646963453 in words is "six hundred forty-six million, nine hundred sixty-three thousand, four hundred fifty-three".