643426363 has 4 divisors (see below), whose sum is σ = 647373928. Its totient is φ = 639478800.

The previous prime is 643426339. The next prime is 643426409. The reversal of 643426363 is 363624346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643426363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643426313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1973538 + ... + 1973863.

It is an arithmetic number, because the mean of its divisors is an integer number (161843482).

Almost surely, 2^643426363 is an apocalyptic number.

643426363 is a deficient number, since it is larger than the sum of its proper divisors (3947565).

643426363 is a wasteful number, since it uses less digits than its factorization.

643426363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3947564.

The product of its digits is 186624, while the sum is 37.

The square root of 643426363 is about 25365.8503307104. The cubic root of 643426363 is about 863.3090303712.

The spelling of 643426363 in words is "six hundred forty-three million, four hundred twenty-six thousand, three hundred sixty-three".