646305503646 has 32 divisors (see below), whose sum is σ = 1410434621568. Its totient is φ = 195806607840.

The previous prime is 646305503639. The next prime is 646305503731.

646305503646 is nontrivially palindromic in base 10.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 646305503595 and 646305503604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 788905 + ... + 1383828.

It is an arithmetic number, because the mean of its divisors is an integer number (44076081924).

Almost surely, 2^646305503646 is an apocalyptic number.

646305503646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

646305503646 is an abundant number, since it is smaller than the sum of its proper divisors (764129117922).

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

646305503646 is a wasteful number, since it uses less digits than its factorization.

646305503646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177256.

The product of its (nonzero) digits is 4665600, while the sum is 48.

The spelling of 646305503646 in words is "six hundred forty-six billion, three hundred five million, five hundred three thousand, six hundred forty-six".