520864939551 has 8 divisors (see below), whose sum is σ = 757621730304. Its totient is φ = 315675720920.

The previous prime is 520864939549. The next prime is 520864939577. The reversal of 520864939551 is 155939468025.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 520864939551 - 2¹ = 520864939549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 520864939491 and 520864939500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520864939541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7891892991 + ... + 7891893056.

It is an arithmetic number, because the mean of its divisors is an integer number (94702716288).

Almost surely, 2^520864939551 is an apocalyptic number.

520864939551 is a deficient number, since it is larger than the sum of its proper divisors (236756790753).

520864939551 is a wasteful number, since it uses less digits than its factorization.

520864939551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15783786061.

The product of its (nonzero) digits is 11664000, while the sum is 57.

The spelling of 520864939551 in words is "five hundred twenty billion, eight hundred sixty-four million, nine hundred thirty-nine thousand, five hundred fifty-one".