521132660401 has 4 divisors (see below), whose sum is σ = 521647106292. Its totient is φ = 520618214512.

The previous prime is 521132660369. The next prime is 521132660417. The reversal of 521132660401 is 104066231125.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22909849600 + 498222810801 = 151360^2 + 705849^2 .

It is a cyclic number.

It is not a de Polignac number, because 521132660401 - 2⁵ = 521132660369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521132660491) 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 3 ways as a sum of consecutive naturals, for example, 257221426 + ... + 257223451.

It is an arithmetic number, because the mean of its divisors is an integer number (130411776573).

Almost surely, 2^521132660401 is an apocalyptic number.

It is an amenable number.

521132660401 is a deficient number, since it is larger than the sum of its proper divisors (514445891).

521132660401 is a wasteful number, since it uses less digits than its factorization.

521132660401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514445890.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 521132660401 its reverse (104066231125), we get a palindrome (625198891526).

The spelling of 521132660401 in words is "five hundred twenty-one billion, one hundred thirty-two million, six hundred sixty thousand, four hundred one".