643465363 has 2 divisors, whose sum is σ = 643465364. Its totient is φ = 643465362.

The previous prime is 643465337. The next prime is 643465367. The reversal of 643465363 is 363564346.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643465363 - 2⁵ = 643465331 is a prime.

It is not a weakly prime, because it can be changed into another prime (643465367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321732681 + 321732682.

It is an arithmetic number, because the mean of its divisors is an integer number (321732682).

Almost surely, 2^643465363 is an apocalyptic number.

643465363 is a deficient number, since it is larger than the sum of its proper divisors (1).

643465363 is an equidigital number, since it uses as much as digits as its factorization.

643465363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 40.

The square root of 643465363 is about 25366.6190691625. The cubic root of 643465363 is about 863.3264726013.

The spelling of 643465363 in words is "six hundred forty-three million, four hundred sixty-five thousand, three hundred sixty-three".