643318053 has 8 divisors (see below), whose sum is σ = 980294208. Its totient is φ = 367610304.

The previous prime is 643318051. The next prime is 643318103. The reversal of 643318053 is 350813346.

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

It is not a de Polignac number, because 643318053 - 2¹ = 643318051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643318051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15317076 + ... + 15317117.

It is an arithmetic number, because the mean of its divisors is an integer number (122536776).

Almost surely, 2^643318053 is an apocalyptic number.

It is an amenable number.

643318053 is a deficient number, since it is larger than the sum of its proper divisors (336976155).

643318053 is a wasteful number, since it uses less digits than its factorization.

643318053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30634203.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 643318053 is about 25363.7152838459. The cubic root of 643318053 is about 863.2605864706.

The spelling of 643318053 in words is "six hundred forty-three million, three hundred eighteen thousand, fifty-three".