520542766891 has 4 divisors (see below), whose sum is σ = 594906019312. Its totient is φ = 446179514472.

The previous prime is 520542766823. The next prime is 520542766901. The reversal of 520542766891 is 198667245025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520542766891 - 2¹¹ = 520542764843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520542716891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37181626200 + ... + 37181626213.

It is an arithmetic number, because the mean of its divisors is an integer number (148726504828).

Almost surely, 2^520542766891 is an apocalyptic number.

520542766891 is a deficient number, since it is larger than the sum of its proper divisors (74363252421).

520542766891 is an equidigital number, since it uses as much as digits as its factorization.

520542766891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74363252420.

The product of its (nonzero) digits is 7257600, while the sum is 55.

The spelling of 520542766891 in words is "five hundred twenty billion, five hundred forty-two million, seven hundred sixty-six thousand, eight hundred ninety-one".