521712670063 has 4 divisors (see below), whose sum is σ = 561844413928. Its totient is φ = 481580926200.

The previous prime is 521712670049. The next prime is 521712670093. The reversal of 521712670063 is 360076217125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521712670063 is a prime.

It is a super-2 number, since 2×521712670063² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521712669998 and 521712670025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521712670033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20065871913 + ... + 20065871938.

It is an arithmetic number, because the mean of its divisors is an integer number (140461103482).

Almost surely, 2^521712670063 is an apocalyptic number.

521712670063 is a deficient number, since it is larger than the sum of its proper divisors (40131743865).

521712670063 is a wasteful number, since it uses less digits than its factorization.

521712670063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40131743864.

The product of its (nonzero) digits is 105840, while the sum is 40.

Adding to 521712670063 its reverse (360076217125), we get a palindrome (881788887188).

The spelling of 521712670063 in words is "five hundred twenty-one billion, seven hundred twelve million, six hundred seventy thousand, sixty-three".