642221158 has 8 divisors (see below), whose sum is σ = 968173200. Its totient is φ = 319496760.

The previous prime is 642221137. The next prime is 642221159. The reversal of 642221158 is 851122246.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642221159) 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 in 3 ways as a sum of consecutive naturals, for example, 806413 + ... + 807208.

It is an arithmetic number, because the mean of its divisors is an integer number (121021650).

Almost surely, 2^642221158 is an apocalyptic number.

642221158 is a deficient number, since it is larger than the sum of its proper divisors (325952042).

642221158 is a wasteful number, since it uses less digits than its factorization.

642221158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613822.

The product of its digits is 7680, while the sum is 31.

The square root of 642221158 is about 25342.0827478722. The cubic root of 642221158 is about 862.7696707130.

It can be divided in two parts, 64 and 2221158, that added together give a palindrome (2221222).

The spelling of 642221158 in words is "six hundred forty-two million, two hundred twenty-one thousand, one hundred fifty-eight".