643666230153 has 24 divisors (see below), whose sum is σ = 947532464736. Its totient is φ = 420952118400.

The previous prime is 643666230127. The next prime is 643666230161. The reversal of 643666230153 is 351032666346.

It is not a de Polignac number, because 643666230153 - 2⁸ = 643666229897 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 643666230099 and 643666230108.

It is not an unprimeable number, because it can be changed into a prime (643666230113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2069283 + ... + 2359928.

It is an arithmetic number, because the mean of its divisors is an integer number (39480519364).

Almost surely, 2^643666230153 is an apocalyptic number.

It is an amenable number.

643666230153 is a deficient number, since it is larger than the sum of its proper divisors (303866234583).

643666230153 is a wasteful number, since it uses less digits than its factorization.

643666230153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4429525 (or 4429522 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 45.

Adding to 643666230153 its reverse (351032666346), we get a palindrome (994698896499).

The spelling of 643666230153 in words is "six hundred forty-three billion, six hundred sixty-six million, two hundred thirty thousand, one hundred fifty-three".