642244255 has 8 divisors (see below), whose sum is σ = 773538624. Its totient is φ = 511898400.

The previous prime is 642244217. The next prime is 642244271. The reversal of 642244255 is 552442246.

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

It is not a de Polignac number, because 642244255 - 2¹⁵ = 642211487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642244255.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235636 + ... + 238345.

It is an arithmetic number, because the mean of its divisors is an integer number (96692328).

Almost surely, 2^642244255 is an apocalyptic number.

642244255 is a deficient number, since it is larger than the sum of its proper divisors (131294369).

642244255 is a wasteful number, since it uses less digits than its factorization.

642244255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474257.

The product of its digits is 76800, while the sum is 34.

The square root of 642244255 is about 25342.5384482297. The cubic root of 642244255 is about 862.7800135427.

The spelling of 642244255 in words is "six hundred forty-two million, two hundred forty-four thousand, two hundred fifty-five".