643566466 has 16 divisors (see below), whose sum is σ = 989876448. Its totient is φ = 313639200.

The previous prime is 643566457. The next prime is 643566487. The reversal of 643566466 is 664665346.

It is a super-3 number, since 3×643566466³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34606 + ... + 49846.

It is an arithmetic number, because the mean of its divisors is an integer number (61867278).

Almost surely, 2^643566466 is an apocalyptic number.

643566466 is a deficient number, since it is larger than the sum of its proper divisors (346309982).

643566466 is a wasteful number, since it uses less digits than its factorization.

643566466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15777.

The product of its digits is 1866240, while the sum is 46.

The square root of 643566466 is about 25368.6118264283. The cubic root of 643566466 is about 863.3716862886.

The spelling of 643566466 in words is "six hundred forty-three million, five hundred sixty-six thousand, four hundred sixty-six".