539858016821 has 8 divisors (see below), whose sum is σ = 542816745240. Its totient is φ = 536900954112.

The previous prime is 539858016811. The next prime is 539858016829. The reversal of 539858016821 is 128610858935.

It can be written as a sum of positive squares in 4 ways, for example, as 31041154225 + 508816862596 = 176185^2 + 713314^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 539858016821 - 2³⁰ = 538784274997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (539858016829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236345 + ... + 1065633.

It is an arithmetic number, because the mean of its divisors is an integer number (67852093155).

Almost surely, 2^539858016821 is an apocalyptic number.

It is an amenable number.

539858016821 is a deficient number, since it is larger than the sum of its proper divisors (2958728419).

539858016821 is a wasteful number, since it uses less digits than its factorization.

539858016821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832855.

The product of its (nonzero) digits is 4147200, while the sum is 56.

The spelling of 539858016821 in words is "five hundred thirty-nine billion, eight hundred fifty-eight million, sixteen thousand, eight hundred twenty-one".