511321420240 has 20 divisors (see below), whose sum is σ = 1188822302244. Its totient is φ = 204528568064.

The previous prime is 511321420201. The next prime is 511321420249. The reversal of 511321420240 is 42024123115.

It can be written as a sum of positive squares in 2 ways, for example, as 285609011776 + 225712408464 = 534424^2 + 475092^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×511321420240² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511321420249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3195758797 + ... + 3195758956.

Almost surely, 2^511321420240 is an apocalyptic number.

It is an amenable number.

511321420240 is an abundant number, since it is smaller than the sum of its proper divisors (677500882004).

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

511321420240 is a wasteful number, since it uses less digits than its factorization.

511321420240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6391517766 (or 6391517760 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 511321420240 its reverse (42024123115), we get a palindrome (553345543355).

The spelling of 511321420240 in words is "five hundred eleven billion, three hundred twenty-one million, four hundred twenty thousand, two hundred forty".