521712670064 has 40 divisors (see below), whose sum is σ = 1116812046240. Its totient is φ = 234837413888.

The previous prime is 521712670049. The next prime is 521712670093. The reversal of 521712670064 is 460076217125.

It is a super-2 number, since 2×521712670064² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 41690729 + ... + 41703240.

It is an arithmetic number, because the mean of its divisors is an integer number (27920301156).

Almost surely, 2^521712670064 is an apocalyptic number.

It is an amenable number.

521712670064 is an abundant number, since it is smaller than the sum of its proper divisors (595099376176).

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

521712670064 is a wasteful number, since it uses less digits than its factorization.

521712670064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83394017 (or 83394011 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 41.

Adding to 521712670064 its reverse (460076217125), we get a palindrome (981788887189).

The spelling of 521712670064 in words is "five hundred twenty-one billion, seven hundred twelve million, six hundred seventy thousand, sixty-four".