643054995 has 24 divisors (see below), whose sum is σ = 1215959472. Its totient is φ = 311784000.

The previous prime is 643054949. The next prime is 643055003. The reversal of 643054995 is 599450346.

643054995 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643054995 - 2¹¹ = 643052947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 643054995.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 649056 + ... + 650045.

It is an arithmetic number, because the mean of its divisors is an integer number (50664978).

Almost surely, 2^643054995 is an apocalyptic number.

643054995 is a deficient number, since it is larger than the sum of its proper divisors (572904477).

643054995 is a wasteful number, since it uses less digits than its factorization.

643054995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299123 (or 1299120 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The square root of 643054995 is about 25358.5290385700. The cubic root of 643054995 is about 863.1429056636.

It can be divided in two parts, 6430 and 54995, that added together give a triangular number (61425 = T₃₅₀).

The spelling of 643054995 in words is "six hundred forty-three million, fifty-four thousand, nine hundred ninety-five".