520666015747 has 24 divisors (see below), whose sum is σ = 601009858800. Its totient is φ = 448238343168.

The previous prime is 520666015729. The next prime is 520666015759. The reversal of 520666015747 is 747510666025.

It is not a de Polignac number, because 520666015747 - 2¹⁵ = 520665982979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520666015747.

It is not an unprimeable number, because it can be changed into a prime (520666015447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 686722 + ... + 1230007.

It is an arithmetic number, because the mean of its divisors is an integer number (25042077450).

Almost surely, 2^520666015747 is an apocalyptic number.

520666015747 is a deficient number, since it is larger than the sum of its proper divisors (80343843053).

520666015747 is a wasteful number, since it uses less digits than its factorization.

520666015747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916823 (or 1916794 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 520666015747 in words is "five hundred twenty billion, six hundred sixty-six million, fifteen thousand, seven hundred forty-seven".