521662975680 has 896 divisors, whose sum is σ = 2106836121600. Its totient is φ = 106221404160.

The previous prime is 521662975663. The next prime is 521662975697. The reversal of 521662975680 is 86579266125.

It is an interprime number because it is at equal distance from previous prime (521662975663) and next prime (521662975697).

It is a self number, because there is not a number n which added to its sum of digits gives 521662975680.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1494736146 + ... + 1494736494.

It is an arithmetic number, because the mean of its divisors is an integer number (2351379600).

Almost surely, 2^521662975680 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 521662975680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1053418060800).

521662975680 is an abundant number, since it is smaller than the sum of its proper divisors (1585173145920).

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

521662975680 is a wasteful number, since it uses less digits than its factorization.

521662975680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737 (or 727 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 57.

The spelling of 521662975680 in words is "five hundred twenty-one billion, six hundred sixty-two million, nine hundred seventy-five thousand, six hundred eighty".