643545334 has 4 divisors (see below), whose sum is σ = 965318004. Its totient is φ = 321772666.

The previous prime is 643545317. The next prime is 643545341. The reversal of 643545334 is 433545346.

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

It is a junction number, because it is equal to n+sod(n) for n = 643545293 and 643545302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160886332 + ... + 160886335.

It is an arithmetic number, because the mean of its divisors is an integer number (241329501).

Almost surely, 2^643545334 is an apocalyptic number.

643545334 is a deficient number, since it is larger than the sum of its proper divisors (321772670).

643545334 is a wasteful number, since it uses less digits than its factorization.

643545334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321772669.

The product of its digits is 259200, while the sum is 37.

The square root of 643545334 is about 25368.1953240667. The cubic root of 643545334 is about 863.3622363607.

The spelling of 643545334 in words is "six hundred forty-three million, five hundred forty-five thousand, three hundred thirty-four".