643155263 has 8 divisors (see below), whose sum is σ = 683218800. Its totient is φ = 603713088.

The previous prime is 643155239. The next prime is 643155421. The reversal of 643155263 is 362551346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643155263 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 (643151263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153206 + ... + 157347.

It is an arithmetic number, because the mean of its divisors is an integer number (85402350).

Almost surely, 2^643155263 is an apocalyptic number.

643155263 is a deficient number, since it is larger than the sum of its proper divisors (40063537).

643155263 is a wasteful number, since it uses less digits than its factorization.

643155263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310681.

The product of its digits is 64800, while the sum is 35.

The square root of 643155263 is about 25360.5059689274. The cubic root of 643155263 is about 863.1877650280.

The spelling of 643155263 in words is "six hundred forty-three million, one hundred fifty-five thousand, two hundred sixty-three".