642005003 has 16 divisors (see below), whose sum is σ = 709582080. Its totient is φ = 578137824.

The previous prime is 642004991. The next prime is 642005011. The reversal of 642005003 is 300500246.

It is a cyclic number.

It is not a de Polignac number, because 642005003 - 2⁸ = 642004747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642005503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66725 + ... + 75737.

It is an arithmetic number, because the mean of its divisors is an integer number (44348880).

Almost surely, 2^642005003 is an apocalyptic number.

642005003 is a deficient number, since it is larger than the sum of its proper divisors (67577077).

642005003 is a wasteful number, since it uses less digits than its factorization.

642005003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9218.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 642005003 is about 25337.8176447775. The cubic root of 642005003 is about 862.6728645466.

Adding to 642005003 its reverse (300500246), we get a palindrome (942505249).

The spelling of 642005003 in words is "six hundred forty-two million, five thousand, three".