643418354 has 8 divisors (see below), whose sum is σ = 965875548. Its totient is φ = 321459840.

The previous prime is 643418327. The next prime is 643418359. The reversal of 643418354 is 453814346.

It is a happy number.

643418354 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 397085329 + 246333025 = 19927^2 + 15695^2 .

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

It is not an unprimeable number, because it can be changed into a prime (643418359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121427 + ... + 126614.

Almost surely, 2^643418354 is an apocalyptic number.

643418354 is a deficient number, since it is larger than the sum of its proper divisors (322457194).

643418354 is a wasteful number, since it uses less digits than its factorization.

643418354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249340.

The product of its digits is 138240, while the sum is 38.

The square root of 643418354 is about 25365.6924604869. The cubic root of 643418354 is about 863.3054483655.

The spelling of 643418354 in words is "six hundred forty-three million, four hundred eighteen thousand, three hundred fifty-four".