643602143 has 4 divisors (see below), whose sum is σ = 677475960. Its totient is φ = 609728328.

The previous prime is 643602097. The next prime is 643602151. The reversal of 643602143 is 341206346.

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

It is a cyclic number.

It is not a de Polignac number, because 643602143 - 2¹⁴ = 643585759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643602173) 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, 16936880 + ... + 16936917.

It is an arithmetic number, because the mean of its divisors is an integer number (169368990).

Almost surely, 2^643602143 is an apocalyptic number.

643602143 is a deficient number, since it is larger than the sum of its proper divisors (33873817).

643602143 is a wasteful number, since it uses less digits than its factorization.

643602143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33873816.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 643602143 is about 25369.3149887812. The cubic root of 643602143 is about 863.3876400630.

Adding to 643602143 its reverse (341206346), we get a palindrome (984808489).

The spelling of 643602143 in words is "six hundred forty-three million, six hundred two thousand, one hundred forty-three".