642433503 has 12 divisors (see below), whose sum is σ = 861189000. Its totient is φ = 425995776.

The previous prime is 642433499. The next prime is 642433523. The reversal of 642433503 is 305334246.

It is not a de Polignac number, because 642433503 - 2² = 642433499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642433523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108873 + ... + 114621.

It is an arithmetic number, because the mean of its divisors is an integer number (71765750).

Almost surely, 2^642433503 is an apocalyptic number.

642433503 is a deficient number, since it is larger than the sum of its proper divisors (218755497).

642433503 is an equidigital number, since it uses as much as digits as its factorization.

642433503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6138 (or 5945 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 30.

The square root of 642433503 is about 25346.2719743950. The cubic root of 642433503 is about 862.8647494022.

Adding to 642433503 its reverse (305334246), we get a palindrome (947767749).

The spelling of 642433503 in words is "six hundred forty-two million, four hundred thirty-three thousand, five hundred three".