642031020403 has 16 divisors (see below), whose sum is σ = 683346442240. Its totient is φ = 601478265600.

The previous prime is 642031020391. The next prime is 642031020451. The reversal of 642031020403 is 304020130246.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642031020403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642031020203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2127238 + ... + 2410228.

It is an arithmetic number, because the mean of its divisors is an integer number (42709152640).

Almost surely, 2^642031020403 is an apocalyptic number.

642031020403 is a deficient number, since it is larger than the sum of its proper divisors (41315421837).

642031020403 is a wasteful number, since it uses less digits than its factorization.

642031020403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284338.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 642031020403 its reverse (304020130246), we get a palindrome (946051150649).

The spelling of 642031020403 in words is "six hundred forty-two billion, thirty-one million, twenty thousand, four hundred three".