643263508057 has 8 divisors (see below), whose sum is σ = 657820850400. Its totient is φ = 628827984864.

The previous prime is 643263508051. The next prime is 643263508073. The reversal of 643263508057 is 750805362346.

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

It is a cyclic number.

It is not a de Polignac number, because 643263508057 - 2²³ = 643255119449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643263508057.

It is not an unprimeable number, because it can be changed into a prime (643263508051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30444108 + ... + 30465229.

It is an arithmetic number, because the mean of its divisors is an integer number (82227606300).

Almost surely, 2^643263508057 is an apocalyptic number.

It is an amenable number.

643263508057 is a deficient number, since it is larger than the sum of its proper divisors (14557342343).

643263508057 is a wasteful number, since it uses less digits than its factorization.

643263508057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60909575.

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 643263508057 in words is "six hundred forty-three billion, two hundred sixty-three million, five hundred eight thousand, fifty-seven".