521942703684864 has 216 divisors, whose sum is σ = 1762827590710368. Its totient is φ = 135569533317120.

The previous prime is 521942703684781. The next prime is 521942703684869. The reversal of 521942703684864 is 468486307249125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521942703684869) 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, 630024727 + ... + 630852630.

It is a 2-persistent number, because it is pandigital, and so is 2⋅521942703684864 = 1043885407369728, but 3⋅521942703684864 = 1565828111054592 is not.

Almost surely, 2^{521942703684864} is an apocalyptic number.

It is an amenable number.

521942703684864 is an abundant number, since it is smaller than the sum of its proper divisors (1240884887025504).

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

521942703684864 is a wasteful number, since it uses less digits than its factorization.

521942703684864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260877401 (or 1260877380 counting only the distinct ones).

The product of its (nonzero) digits is 557383680, while the sum is 69.

The spelling of 521942703684864 in words is "five hundred twenty-one trillion, nine hundred forty-two billion, seven hundred three million, six hundred eighty-four thousand, eight hundred sixty-four".