642433566 has 16 divisors (see below), whose sum is σ = 1288316304. Its totient is φ = 213569664.

The previous prime is 642433559. The next prime is 642433637. The reversal of 642433566 is 665334246.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 141291 + ... + 145766.

It is an arithmetic number, because the mean of its divisors is an integer number (80519769).

Almost surely, 2^642433566 is an apocalyptic number.

642433566 is an abundant number, since it is smaller than the sum of its proper divisors (645882738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642433566 is a wasteful number, since it uses less digits than its factorization.

642433566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287435.

The product of its digits is 311040, while the sum is 39.

The square root of 642433566 is about 25346.2732171813. The cubic root of 642433566 is about 862.8647776077.

The spelling of 642433566 in words is "six hundred forty-two million, four hundred thirty-three thousand, five hundred sixty-six".