521671610620 has 48 divisors (see below), whose sum is σ = 1127869848000. Its totient is φ = 202556090880.

The previous prime is 521671610617. The next prime is 521671610653. The reversal of 521671610620 is 26016176125.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 521671610620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1435275 + ... + 1761634.

It is an arithmetic number, because the mean of its divisors is an integer number (23497288500).

Almost surely, 2^521671610620 is an apocalyptic number.

It is an amenable number.

521671610620 is an abundant number, since it is smaller than the sum of its proper divisors (606198237380).

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

521671610620 is a wasteful number, since it uses less digits than its factorization.

521671610620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3197158 (or 3197156 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

Adding to 521671610620 its reverse (26016176125), we get a palindrome (547687786745).

The spelling of 521671610620 in words is "five hundred twenty-one billion, six hundred seventy-one million, six hundred ten thousand, six hundred twenty".