521580419997 has 64 divisors (see below), whose sum is σ = 858526470144. Its totient is φ = 274285186560.

The previous prime is 521580419993. The next prime is 521580420001. The reversal of 521580419997 is 799914085125.

It is an interprime number because it is at equal distance from previous prime (521580419993) and next prime (521580420001).

It is not a de Polignac number, because 521580419997 - 2² = 521580419993 is a prime.

It is a super-2 number, since 2×521580419997² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 521580419997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521580419993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 149405422 + ... + 149408912.

It is an arithmetic number, because the mean of its divisors is an integer number (13414476096).

Almost surely, 2^521580419997 is an apocalyptic number.

It is an amenable number.

521580419997 is a deficient number, since it is larger than the sum of its proper divisors (336946050147).

521580419997 is a wasteful number, since it uses less digits than its factorization.

521580419997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5018.

The product of its (nonzero) digits is 8164800, while the sum is 60.

The spelling of 521580419997 in words is "five hundred twenty-one billion, five hundred eighty million, four hundred nineteen thousand, nine hundred ninety-seven".