643042363 has 2 divisors, whose sum is σ = 643042364. Its totient is φ = 643042362.

The previous prime is 643042343. The next prime is 643042369. The reversal of 643042363 is 363240346.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643042363 is a prime.

It is a super-2 number, since 2×643042363² = 827006961225247538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (643042369) 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, 321521181 + 321521182.

It is an arithmetic number, because the mean of its divisors is an integer number (321521182).

Almost surely, 2^643042363 is an apocalyptic number.

643042363 is a deficient number, since it is larger than the sum of its proper divisors (1).

643042363 is an equidigital number, since it uses as much as digits as its factorization.

643042363 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 31.

The square root of 643042363 is about 25358.2799692724. The cubic root of 643042363 is about 863.1372538439.

The spelling of 643042363 in words is "six hundred forty-three million, forty-two thousand, three hundred sixty-three".