511205054440 has 16 divisors (see below), whose sum is σ = 1150211372580. Its totient is φ = 204482021760.

The previous prime is 511205054407. The next prime is 511205054441. The reversal of 511205054440 is 44450502115.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 510450233764 + 754820676 = 714458^2 + 27474^2 .

It is a super-2 number, since 2×511205054440² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (511205054441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6390063141 + ... + 6390063220.

Almost surely, 2^511205054440 is an apocalyptic number.

It is an amenable number.

511205054440 is an abundant number, since it is smaller than the sum of its proper divisors (639006318140).

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

511205054440 is a wasteful number, since it uses less digits than its factorization.

511205054440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12780126372 (or 12780126368 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 31.

Adding to 511205054440 its reverse (44450502115), we get a palindrome (555655556555).

The spelling of 511205054440 in words is "five hundred eleven billion, two hundred five million, fifty-four thousand, four hundred forty".