521630045640 has 256 divisors, whose sum is σ = 1943102649600. Its totient is φ = 123371366400.

The previous prime is 521630045633. The next prime is 521630045683. The reversal of 521630045640 is 46540036125.

521630045640 is a `hidden beast` number, since 5 + 2 + 1 + 6 + 3 + 0 + 0 + 4 + 5 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 521630045595 and 521630045604.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48387 + ... + 1022546.

It is an arithmetic number, because the mean of its divisors is an integer number (7590244725).

Almost surely, 2^521630045640 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 521630045640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971551324800).

521630045640 is an abundant number, since it is smaller than the sum of its proper divisors (1421472603960).

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

521630045640 is a wasteful number, since it uses less digits than its factorization.

521630045640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071005 (or 1070995 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 521630045640 in words is "five hundred twenty-one billion, six hundred thirty million, forty-five thousand, six hundred forty".