521494043616 has 576 divisors, whose sum is σ = 1923161486400. Its totient is φ = 136259407872.

The previous prime is 521494043611. The next prime is 521494043659. The reversal of 521494043616 is 616340494125.

521494043616 is a `hidden beast` number, since 5 + 21 + 4 + 9 + 4 + 0 + 4 + 3 + 616 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521494043611) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 59985766 + ... + 59994458.

It is an arithmetic number, because the mean of its divisors is an integer number (3338822025).

Almost surely, 2^521494043616 is an apocalyptic number.

521494043616 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521494043616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (961580743200).

521494043616 is an abundant number, since it is smaller than the sum of its proper divisors (1401667442784).

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

521494043616 is a wasteful number, since it uses less digits than its factorization.

521494043616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8848 (or 8827 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 521494043616 in words is "five hundred twenty-one billion, four hundred ninety-four million, forty-three thousand, six hundred sixteen".