643383357 has 16 divisors (see below), whose sum is σ = 909074880. Its totient is φ = 404028800.

The previous prime is 643383319. The next prime is 643383359. The reversal of 643383357 is 753383346.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 643383357 - 2⁷ = 643383229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643383359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86619 + ... + 93752.

It is an arithmetic number, because the mean of its divisors is an integer number (56817180).

Almost surely, 2^643383357 is an apocalyptic number.

It is an amenable number.

643383357 is a deficient number, since it is larger than the sum of its proper divisors (265691523).

643383357 is a wasteful number, since it uses less digits than its factorization.

643383357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180444.

The product of its digits is 544320, while the sum is 42.

The square root of 643383357 is about 25365.0026020105. The cubic root of 643383357 is about 863.2897956939.

The spelling of 643383357 in words is "six hundred forty-three million, three hundred eighty-three thousand, three hundred fifty-seven".