501660817640 has 16 divisors (see below), whose sum is σ = 1128736839780. Its totient is φ = 200664327040.

The previous prime is 501660817639. The next prime is 501660817667. The reversal of 501660817640 is 46718066105.

It can be written as a sum of positive squares in 2 ways, for example, as 492655187236 + 9005630404 = 701894^2 + 94898^2 .

It is a junction number, because it is equal to n+sod(n) for n = 501660817591 and 501660817600.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6270760181 + ... + 6270760260.

Almost surely, 2^501660817640 is an apocalyptic number.

It is an amenable number.

501660817640 is an abundant number, since it is smaller than the sum of its proper divisors (627076022140).

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

501660817640 is a wasteful number, since it uses less digits than its factorization.

501660817640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12541520452 (or 12541520448 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 501660817640 in words is "five hundred one billion, six hundred sixty million, eight hundred seventeen thousand, six hundred forty".