521144165542 has 128 divisors (see below), whose sum is σ = 1056390451200. Its totient is φ = 186212183040.

The previous prime is 521144165417. The next prime is 521144165557. The reversal of 521144165542 is 245561441125.

It is a junction number, because it is equal to n+sod(n) for n = 521144165495 and 521144165504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 218691283 + ... + 218693665.

It is an arithmetic number, because the mean of its divisors is an integer number (8253050400).

Almost surely, 2^521144165542 is an apocalyptic number.

521144165542 is an abundant number, since it is smaller than the sum of its proper divisors (535246285658).

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

521144165542 is a wasteful number, since it uses less digits than its factorization.

521144165542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3078.

The product of its digits is 192000, while the sum is 40.

It can be divided in two parts, 521144 and 165542, that added together give a palindrome (686686).

The spelling of 521144165542 in words is "five hundred twenty-one billion, one hundred forty-four million, one hundred sixty-five thousand, five hundred forty-two".