643045562 has 4 divisors (see below), whose sum is σ = 964568346. Its totient is φ = 321522780.

The previous prime is 643045561. The next prime is 643045603. The reversal of 643045562 is 265540346.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 265540346 = 2 ⋅132770173.

It can be written as a sum of positive squares in only one way, i.e., 338228881 + 304816681 = 18391^2 + 17459^2 .

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (643045561) 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 as a sum of consecutive naturals, namely, 160761389 + ... + 160761392.

Almost surely, 2^643045562 is an apocalyptic number.

643045562 is a deficient number, since it is larger than the sum of its proper divisors (321522784).

643045562 is a wasteful number, since it uses less digits than its factorization.

643045562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321522783.

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 643045562 is about 25358.3430452386. The cubic root of 643045562 is about 863.1386851501.

The spelling of 643045562 in words is "six hundred forty-three million, forty-five thousand, five hundred sixty-two".