642423653 has 8 divisors (see below), whose sum is σ = 655540128. Its totient is φ = 629344144.

The previous prime is 642423623. The next prime is 642423673. The reversal of 642423653 is 356324246.

642423653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 642423653 - 2¹⁶ = 642358117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642423623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27326 + ... + 45072.

It is an arithmetic number, because the mean of its divisors is an integer number (81942516).

Almost surely, 2^642423653 is an apocalyptic number.

It is an amenable number.

642423653 is a deficient number, since it is larger than the sum of its proper divisors (13116475).

642423653 is a wasteful number, since it uses less digits than its factorization.

642423653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18483.

The product of its digits is 103680, while the sum is 35.

The square root of 642423653 is about 25346.0776649958. The cubic root of 642423653 is about 862.8603394718.

Adding to 642423653 its reverse (356324246), we get a palindrome (998747899).

The spelling of 642423653 in words is "six hundred forty-two million, four hundred twenty-three thousand, six hundred fifty-three".