521943607980 has 192 divisors, whose sum is σ = 1677860352000. Its totient is φ = 134562193920.

The previous prime is 521943607979. The next prime is 521943607987. The reversal of 521943607980 is 89706349125.

521943607980 is a `hidden beast` number, since 5 + 2 + 194 + 360 + 7 + 98 + 0 = 666.

It is a super-2 number, since 2×521943607980² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (521943607987) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 17545399 + ... + 17575121.

It is an arithmetic number, because the mean of its divisors is an integer number (8738856000).

It is a 2-persistent number, because it is pandigital, and so is 2⋅521943607980 = 1043887215960, but 3⋅521943607980 = 1565830823940 is not.

Almost surely, 2^521943607980 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 521943607980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (838930176000).

521943607980 is an abundant number, since it is smaller than the sum of its proper divisors (1155916744020).

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

521943607980 is a wasteful number, since it uses less digits than its factorization.

521943607980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30821 (or 30813 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 521943607980 in words is "five hundred twenty-one billion, nine hundred forty-three million, six hundred seven thousand, nine hundred eighty".