521643504541144 has 32 divisors (see below), whose sum is σ = 1036236282292800. Its totient is φ = 245332214484480.

The previous prime is 521643504541123. The next prime is 521643504541199. The reversal of 521643504541144 is 441145405346125.

It is a super-2 number, since 2×521643504541144² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1148848512 + ... + 1149302479.

It is an arithmetic number, because the mean of its divisors is an integer number (32382383821650).

Almost surely, 2^{521643504541144} is an apocalyptic number.

It is an amenable number.

521643504541144 is a deficient number, since it is larger than the sum of its proper divisors (514592777751656).

521643504541144 is a wasteful number, since it uses less digits than its factorization.

521643504541144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298152683 (or 2298152679 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 49.

Adding to 521643504541144 its reverse (441145405346125), we get a palindrome (962788909887269).

The spelling of 521643504541144 in words is "five hundred twenty-one trillion, six hundred forty-three billion, five hundred four million, five hundred forty-one thousand, one hundred forty-four".