52138521385 has 8 divisors (see below), whose sum is σ = 62567466120. Its totient is φ = 41709990144.

The previous prime is 52138521343. The next prime is 52138521419. The reversal of 52138521385 is 58312583125.

It can be written as a sum of positive squares in 4 ways, for example, as 437311744 + 51701209641 = 20912^2 + 227379^2 .

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 52138521385 - 2²¹ = 52136424233 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376851 + ... + 496279.

It is an arithmetic number, because the mean of its divisors is an integer number (7820933265).

Almost surely, 2^52138521385 is an apocalyptic number.

It is an amenable number.

52138521385 is a deficient number, since it is larger than the sum of its proper divisors (10428944735).

52138521385 is a wasteful number, since it uses less digits than its factorization.

52138521385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206747.

The product of its digits is 288000, while the sum is 43.

The spelling of 52138521385 in words is "fifty-two billion, one hundred thirty-eight million, five hundred twenty-one thousand, three hundred eighty-five".