646245204100 has 18 divisors (see below), whose sum is σ = 1402352093114. Its totient is φ = 258498081600.

The previous prime is 646245204071. The next prime is 646245204113. The reversal of 646245204100 is 1402542646.

It can be written as a sum of positive squares in 3 ways, for example, as 33206315076 + 613038889024 = 182226^2 + 782968^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3231225921 + ... + 3231226120.

Almost surely, 2^646245204100 is an apocalyptic number.

It is an amenable number.

646245204100 is an abundant number, since it is smaller than the sum of its proper divisors (756106889014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646245204100 is a wasteful number, since it uses less digits than its factorization.

646245204100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462452055 (or 6462452048 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 646245204100 its reverse (1402542646), we get a palindrome (647647746746).

The spelling of 646245204100 in words is "six hundred forty-six billion, two hundred forty-five million, two hundred four thousand, one hundred".