520138275991 has 8 divisors (see below), whose sum is σ = 536181936480. Its totient is φ = 504199135008.

The previous prime is 520138275971. The next prime is 520138276013. The reversal of 520138275991 is 199572831025.

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 520138275991 - 2⁵ = 520138275959 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 (520138275931) 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, 26119771 + ... + 26139676.

It is an arithmetic number, because the mean of its divisors is an integer number (67022742060).

Almost surely, 2^520138275991 is an apocalyptic number.

520138275991 is a deficient number, since it is larger than the sum of its proper divisors (16043660489).

520138275991 is a wasteful number, since it uses less digits than its factorization.

520138275991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52259753.

The product of its (nonzero) digits is 1360800, while the sum is 52.

The spelling of 520138275991 in words is "five hundred twenty billion, one hundred thirty-eight million, two hundred seventy-five thousand, nine hundred ninety-one".