521022444818 has 6 divisors (see below), whose sum is σ = 781535198439.
Its totient is φ = 260510712006.
The previous prime is 521022444769. The next prime is 521022444827. The reversal of 521022444818 is 818444220125.
It can be written as a sum of positive squares in only one way, i.e., 260511222409 + 260511222409 = 510403^2 + 510403^2
It is an ABA number since it can be written as A⋅BA, here for A=2, B=510403.
It is a Duffinian number.
It is an unprimeable number.
It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 765605 + ... + 1276007.
Almost surely, 2521022444818 is an apocalyptic number.
521022444818 is a deficient number, since it is larger than the sum of its proper divisors (260512753621).
521022444818 is an frugal number, since it uses more digits than its factorization.
521022444818 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1020808 (or 510405 counting only the distinct ones).
The product of its (nonzero) digits is 163840, while the sum is 41.
The spelling of 521022444818 in words is "five hundred twenty-one billion, twenty-two million, four hundred forty-four thousand, eight hundred eighteen".