520861599720 has 480 divisors, whose sum is σ = 2199205008000. Its totient is φ = 108230411520.

The previous prime is 520861599703. The next prime is 520861599757. The reversal of 520861599720 is 27995168025.

520861599720 is a `hidden beast` number, since 5 + 20 + 8 + 6 + 1 + 599 + 7 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2649381 + ... + 2839179.

It is an arithmetic number, because the mean of its divisors is an integer number (4581677100).

Almost surely, 2^520861599720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520861599720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1099602504000).

520861599720 is an abundant number, since it is smaller than the sum of its proper divisors (1678343408280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

520861599720 is a wasteful number, since it uses less digits than its factorization.

520861599720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189851 (or 189827 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The spelling of 520861599720 in words is "five hundred twenty billion, eight hundred sixty-one million, five hundred ninety-nine thousand, seven hundred twenty".