520138704879 has 16 divisors (see below), whose sum is σ = 779234018400. Its totient is φ = 342862964928.

The previous prime is 520138704853. The next prime is 520138704901. The reversal of 520138704879 is 978407831025.

It is a happy number.

520138704879 is a `hidden beast` number, since 5 + 20 + 138 + 7 + 0 + 487 + 9 = 666.

It is not a de Polignac number, because 520138704879 - 2⁵ = 520138704847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520138704079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108224544 + ... + 108229349.

It is an arithmetic number, because the mean of its divisors is an integer number (48702126150).

Almost surely, 2^520138704879 is an apocalyptic number.

520138704879 is a deficient number, since it is larger than the sum of its proper divisors (259095313521).

520138704879 is a wasteful number, since it uses less digits than its factorization.

520138704879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216453991 (or 216453985 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 520138704879 in words is "five hundred twenty billion, one hundred thirty-eight million, seven hundred four thousand, eight hundred seventy-nine".