643665230 has 24 divisors (see below), whose sum is σ = 1254579192. Its totient is φ = 237660384.

The previous prime is 643665227. The next prime is 643665233. The reversal of 643665230 is 32566346.

It is an interprime number because it is at equal distance from previous prime (643665227) and next prime (643665233).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643665233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188744 + ... + 192123.

It is an arithmetic number, because the mean of its divisors is an integer number (52274133).

Almost surely, 2^643665230 is an apocalyptic number.

643665230 is a deficient number, since it is larger than the sum of its proper divisors (610913962).

643665230 is a wasteful number, since it uses less digits than its factorization.

643665230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380900 (or 380887 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 35.

The square root of 643665230 is about 25370.5583304743. The cubic root of 643665230 is about 863.4158493933.

It can be divided in two parts, 64366 and 5230, that added together give a palindrome (69596).

The spelling of 643665230 in words is "six hundred forty-three million, six hundred sixty-five thousand, two hundred thirty".