520561262778 has 8 divisors (see below), whose sum is σ = 1041122525568. Its totient is φ = 173520420924.

The previous prime is 520561262761. The next prime is 520561262779. The reversal of 520561262778 is 877262165025.

It is a sphenic number, since it is the product of 3 distinct primes.

520561262778 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 520561262778.

It is not an unprimeable number, because it can be changed into a prime (520561262779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43380105226 + ... + 43380105237.

It is an arithmetic number, because the mean of its divisors is an integer number (130140315696).

Almost surely, 2^520561262778 is an apocalyptic number.

520561262778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

520561262778 is a wasteful number, since it uses less digits than its factorization.

520561262778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86760210468.

The product of its (nonzero) digits is 2822400, while the sum is 51.

The spelling of 520561262778 in words is "five hundred twenty billion, five hundred sixty-one million, two hundred sixty-two thousand, seven hundred seventy-eight".