513666321020 has 48 divisors (see below), whose sum is σ = 1101933600768. Its totient is φ = 201043191360.

The previous prime is 513666320987. The next prime is 513666321109. The reversal of 513666321020 is 20123666315.

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, 3694565 + ... + 3831075.

It is an arithmetic number, because the mean of its divisors is an integer number (22956950016).

Almost surely, 2^513666321020 is an apocalyptic number.

It is an amenable number.

513666321020 is an abundant number, since it is smaller than the sum of its proper divisors (588267279748).

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

513666321020 is a wasteful number, since it uses less digits than its factorization.

513666321020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140570 (or 140568 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

Adding to 513666321020 its reverse (20123666315), we get a palindrome (533789987335).

The spelling of 513666321020 in words is "five hundred thirteen billion, six hundred sixty-six million, three hundred twenty-one thousand, twenty".